Aguiló, Isabel; Riera, Juan Vicente; Suñer, Jaume; Torrens, Joan Modus tollens with respect to uninorms: \(U\)-modus tollens. (English) Zbl 1477.03078 Int. J. Approx. Reasoning 127, 54-69 (2020). Reviewer: Radko Mesiar (Bratislava) MSC: 03B52 PDFBibTeX XMLCite \textit{I. Aguiló} et al., Int. J. Approx. Reasoning 127, 54--69 (2020; Zbl 1477.03078) Full Text: DOI
Kolesárová, Anna; Massanet, Sebastia; Mesiar, Radko; Riera, Juan Vicente; Torrens, Joan Polynomial constructions of fuzzy implication functions: the quadratic case. (English) Zbl 1451.03021 Inf. Sci. 494, 60-79 (2019). MSC: 03B52 PDFBibTeX XMLCite \textit{A. Kolesárová} et al., Inf. Sci. 494, 60--79 (2019; Zbl 1451.03021) Full Text: DOI
Massanet, Sebastia; Pradera, Ana; Ruiz-Aguilera, Daniel; Torrens, Joan Equivalence and characterization of probabilistic and survival implications. (English) Zbl 1423.03083 Fuzzy Sets Syst. 359, 63-79 (2019). MSC: 03B52 PDFBibTeX XMLCite \textit{S. Massanet} et al., Fuzzy Sets Syst. 359, 63--79 (2019; Zbl 1423.03083) Full Text: DOI
Massanet, Sebastia; Recasens, Jordi; Torrens, Joan Some characterizations of \(T\)-power based implications. (English) Zbl 1423.03084 Fuzzy Sets Syst. 359, 42-62 (2019). MSC: 03B52 PDFBibTeX XMLCite \textit{S. Massanet} et al., Fuzzy Sets Syst. 359, 42--62 (2019; Zbl 1423.03084) Full Text: DOI
Mas, Margarita; Ruiz-Aguilera, Daniel; Torrens, Joan Uninorm based residual implications satisfying the modus ponens property with respect to a uninorm. (English) Zbl 1423.03082 Fuzzy Sets Syst. 359, 22-41 (2019). MSC: 03B52 PDFBibTeX XMLCite \textit{M. Mas} et al., Fuzzy Sets Syst. 359, 22--41 (2019; Zbl 1423.03082) Full Text: DOI
Pradera, A.; Massanet, S.; Ruiz-Aguilera, D.; Torrens, J. The non-contradiction principle related to natural negations of fuzzy implication functions. (English) Zbl 1423.03089 Fuzzy Sets Syst. 359, 3-21 (2019). MSC: 03B52 PDFBibTeX XMLCite \textit{A. Pradera} et al., Fuzzy Sets Syst. 359, 3--21 (2019; Zbl 1423.03089) Full Text: DOI
Su, Yong; Riera, J. V.; Ruiz-Aguilera, D.; Torrens, J. The modularity condition for uninorms revisited. (English) Zbl 1423.03228 Fuzzy Sets Syst. 357, 27-46 (2019). MSC: 03E72 03B52 PDFBibTeX XMLCite \textit{Y. Su} et al., Fuzzy Sets Syst. 357, 27--46 (2019; Zbl 1423.03228) Full Text: DOI
Aguiló, I.; Suñer, J.; Torrens, J. How to modify a fuzzy implication function to satisfy a desired property. (English) Zbl 1448.03016 Int. J. Approx. Reasoning 103, 168-183 (2018). MSC: 03B52 PDFBibTeX XMLCite \textit{I. Aguiló} et al., Int. J. Approx. Reasoning 103, 168--183 (2018; Zbl 1448.03016) Full Text: DOI
Su, Yong; Liu, Hua-Wen; Riera, J. V.; Ruiz-Aguilera, D.; Torrens, J. The distributivity equation for uninorms revisited. (English) Zbl 1380.03056 Fuzzy Sets Syst. 334, 1-23 (2018). MSC: 03E72 03B52 PDFBibTeX XMLCite \textit{Y. Su} et al., Fuzzy Sets Syst. 334, 1--23 (2018; Zbl 1380.03056) Full Text: DOI
Massanet, S.; Pradera, A.; Ruiz-Aguilera, D.; Torrens, J. From three to one: equivalence and characterization of material implications derived from co-copulas, probabilistic \(S\)-implications and survival \(S\)-implications. (English) Zbl 1394.03044 Fuzzy Sets Syst. 323, 103-116 (2017). MSC: 03B52 62H05 62H86 68T37 PDFBibTeX XMLCite \textit{S. Massanet} et al., Fuzzy Sets Syst. 323, 103--116 (2017; Zbl 1394.03044) Full Text: DOI
Su, Yong; Liu, Hua-Wen; Riera, J. V.; Ruiz-Aguilera, D.; Torrens, J. The migrativity equation for uninorms revisited. (English) Zbl 1376.03053 Fuzzy Sets Syst. 323, 56-78 (2017). Reviewer: Antonín Dvořák (Ostrava) MSC: 03E72 68T37 PDFBibTeX XMLCite \textit{Y. Su} et al., Fuzzy Sets Syst. 323, 56--78 (2017; Zbl 1376.03053) Full Text: DOI
Massanet, Sebastia; Recasens, Jordi; Torrens, Joan Fuzzy implication functions based on powers of continuous t-norms. (English) Zbl 1404.03024 Int. J. Approx. Reasoning 83, 265-279 (2017); corrigendum ibid. 104, 144-147 (2019). MSC: 03B52 PDFBibTeX XMLCite \textit{S. Massanet} et al., Int. J. Approx. Reasoning 83, 265--279 (2017; Zbl 1404.03024) Full Text: DOI Link
Massanet, Sebastia; Riera, Juan Vicente; Torrens, Joan A new vision of Zadeh’s \(Z\)-numbers. (English) Zbl 1455.68212 Carvalho, Joao Paulo (ed.) et al., Information processing and management of uncertainty in knowledge-based systems. 16th international conference, IPMU 2016, Eindhoven, The Netherlands, June 20–24, 2016. Proceedings. Part II. Cham: Springer. Commun. Comput. Inf. Sci. 611, 581-592 (2016). MSC: 68T37 03E72 PDFBibTeX XMLCite \textit{S. Massanet} et al., Commun. Comput. Inf. Sci. 611, 581--592 (2016; Zbl 1455.68212) Full Text: DOI
Massanet, Sebastia; Riera, Juan Vicente; Torrens, Joan A new look on the ordinal sum of fuzzy implication functions. (English) Zbl 1452.03076 Carvalho, Joao Paulo (ed.) et al., Information processing and management of uncertainty in knowledge-based systems. 16th international conference, IPMU 2016, Eindhoven, The Netherlands, June 20–24, 2016. Proceedings. Part I. Cham: Springer. Commun. Comput. Inf. Sci. 610, 399-410 (2016). MSC: 03B52 PDFBibTeX XMLCite \textit{S. Massanet} et al., Commun. Comput. Inf. Sci. 610, 399--410 (2016; Zbl 1452.03076) Full Text: DOI
Mas, Margalida; Monserrat, Miquel; Ruiz-Aguilera, Daniel; Torrens, Joan On a generalization of the modus ponens: \(U\)-conditionality. (English) Zbl 1452.03075 Carvalho, Joao Paulo (ed.) et al., Information processing and management of uncertainty in knowledge-based systems. 16th international conference, IPMU 2016, Eindhoven, The Netherlands, June 20–24, 2016. Proceedings. Part I. Cham: Springer. Commun. Comput. Inf. Sci. 610, 387-398 (2016). MSC: 03B52 PDFBibTeX XMLCite \textit{M. Mas} et al., Commun. Comput. Inf. Sci. 610, 387--398 (2016; Zbl 1452.03075) Full Text: DOI
Aguiló, Isabel; Suñer, Jaume; Torrens, Joan A new look on fuzzy implication functions: \(FNI\)-implications. (English) Zbl 1452.68198 Carvalho, Joao Paulo (ed.) et al., Information processing and management of uncertainty in knowledge-based systems. 16th international conference, IPMU 2016, Eindhoven, The Netherlands, June 20–24, 2016. Proceedings. Part I. Cham: Springer. Commun. Comput. Inf. Sci. 610, 375-386 (2016). MSC: 68T37 03B52 PDFBibTeX XMLCite \textit{I. Aguiló} et al., Commun. Comput. Inf. Sci. 610, 375--386 (2016; Zbl 1452.68198) Full Text: DOI
Massanet, Sebastia; Vicente Riera, Juan; Torrens, Joan; Herrera-Viedma, Enrique A model based on subjective linguistic preference relations for group decision making problems. (English) Zbl 1429.91117 Inf. Sci. 355-356, 249-264 (2016). MSC: 91B06 91B08 PDFBibTeX XMLCite \textit{S. Massanet} et al., Inf. Sci. 355--356, 249--264 (2016; Zbl 1429.91117) Full Text: DOI
Su, Yong; Liu, Hua-wen; Ruiz-Aguilera, Daniel; Vicente Riera, J.; Torrens, Joan On the distributivity property for uninorms. (English) Zbl 1392.03052 Fuzzy Sets Syst. 287, 184-202 (2016). MSC: 03E72 PDFBibTeX XMLCite \textit{Y. Su} et al., Fuzzy Sets Syst. 287, 184--202 (2016; Zbl 1392.03052) Full Text: DOI
Drygaś, Paweł; Ruiz-Aguilera, Daniel; Torrens, Joan A characterization of a class of uninorms with continuous underlying operators. (English) Zbl 1392.03050 Fuzzy Sets Syst. 287, 137-153 (2016). MSC: 03E72 PDFBibTeX XMLCite \textit{P. Drygaś} et al., Fuzzy Sets Syst. 287, 137--153 (2016; Zbl 1392.03050) Full Text: DOI
Mas, M.; Monserrat, M.; Ruiz-Aguilera, D.; Torrens, J. RU and \((U,N)\)-implications satisfying modus ponens. (English) Zbl 1348.03024 Int. J. Approx. Reasoning 73, 123-137 (2016). Reviewer: Michał Baczyński (Katowice) MSC: 03B52 PDFBibTeX XMLCite \textit{M. Mas} et al., Int. J. Approx. Reasoning 73, 123--137 (2016; Zbl 1348.03024) Full Text: DOI
Aguiló, I.; Suñer, J.; Torrens, J. New types of contrapositivisation of fuzzy implications with respect to fuzzy negations. (English) Zbl 1387.03017 Inf. Sci. 322, 223-236 (2015). MSC: 03B52 PDFBibTeX XMLCite \textit{I. Aguiló} et al., Inf. Sci. 322, 223--236 (2015; Zbl 1387.03017) Full Text: DOI
Fodor, János; Torrens, Joan An overview of fuzzy logic connectives on the unit interval. (English) Zbl 1368.03028 Fuzzy Sets Syst. 281, 183-187 (2015). MSC: 03B52 03-03 01A60 01A61 PDFBibTeX XMLCite \textit{J. Fodor} and \textit{J. Torrens}, Fuzzy Sets Syst. 281, 183--187 (2015; Zbl 1368.03028) Full Text: DOI
Mas, M.; Massanet, S.; Ruiz-Aguilera, D.; Torrens, J. A survey on the existing classes of uninorms. (English) Zbl 1361.03022 J. Intell. Fuzzy Syst. 29, No. 3, 1021-1037 (2015). MSC: 03B52 PDFBibTeX XMLCite \textit{M. Mas} et al., J. Intell. Fuzzy Syst. 29, No. 3, 1021--1037 (2015; Zbl 1361.03022) Full Text: DOI
Ruiz-Aguilera, D.; Torrens, J. A characterization of discrete uninorms having smooth underlying operators. (English) Zbl 1361.03027 Fuzzy Sets Syst. 268, 44-58 (2015). MSC: 03B52 PDFBibTeX XMLCite \textit{D. Ruiz-Aguilera} and \textit{J. Torrens}, Fuzzy Sets Syst. 268, 44--58 (2015; Zbl 1361.03027) Full Text: DOI
Riera, J. Vicente; Torrens, Joan Using discrete fuzzy numbers in the aggregation of incomplete qualitative information. (English) Zbl 1360.68846 Fuzzy Sets Syst. 264, 121-137 (2015). MSC: 68T37 PDFBibTeX XMLCite \textit{J. V. Riera} and \textit{J. Torrens}, Fuzzy Sets Syst. 264, 121--137 (2015; Zbl 1360.68846) Full Text: DOI
Mas, M.; Monserrat, M.; Ruiz-Aguilera, D.; Torrens, J. Migrative uninorms and nullnorms over t-norms and t-conorms. (English) Zbl 1360.68844 Fuzzy Sets Syst. 261, 20-32 (2015). MSC: 68T37 03B52 PDFBibTeX XMLCite \textit{M. Mas} et al., Fuzzy Sets Syst. 261, 20--32 (2015; Zbl 1360.68844) Full Text: DOI
Mas, Margarita; Mayor, Gaspar; Monserrat, Miquel; Torrens, Joan Residual implications from discrete uninorms. A characterization. (English) Zbl 1368.03031 Magdalena, Luis (ed.) et al., Enric Trillas: a passion for fuzzy sets. A collection of recent works on fuzzy logic. Cham: Springer (ISBN 978-3-319-16234-8/hbk; 978-3-319-16235-5/ebook). Studies in Fuzziness and Soft Computing 322, 27-40 (2015). Reviewer: Mirko Navara (Praha) MSC: 03B52 PDFBibTeX XMLCite \textit{M. Mas} et al., Stud. Fuzziness Soft Comput. 322, 27--40 (2015; Zbl 1368.03031) Full Text: DOI
Massanet, Sebastia; Riera, Juan Vicente; Torrens, Joan; Herrera-Viedma, Enrique A new linguistic computational model based on discrete fuzzy numbers for computing with words. (English) Zbl 1320.68194 Inf. Sci. 258, 277-290 (2014). MSC: 68T37 PDFBibTeX XMLCite \textit{S. Massanet} et al., Inf. Sci. 258, 277--290 (2014; Zbl 1320.68194) Full Text: DOI
Vicente Riera, J.; Torrens, Joan Aggregation functions on the set of discrete fuzzy numbers defined from a pair of discrete aggregations. (English) Zbl 1315.68247 Fuzzy Sets Syst. 241, 76-93 (2014). MSC: 68T37 91B06 PDFBibTeX XMLCite \textit{J. Vicente Riera} and \textit{J. Torrens}, Fuzzy Sets Syst. 241, 76--93 (2014; Zbl 1315.68247) Full Text: DOI
Mas, M.; Monserrat, M.; Torrens, J. Kernel aggregation functions on finite scales. Constructions from their marginals. (English) Zbl 1315.68240 Fuzzy Sets Syst. 241, 27-40 (2014). MSC: 68T37 PDFBibTeX XMLCite \textit{M. Mas} et al., Fuzzy Sets Syst. 241, 27--40 (2014; Zbl 1315.68240) Full Text: DOI
Riera, J. Vicente; Torrens, Joan Residual implications on the set of discrete fuzzy numbers. (English) Zbl 1321.03043 Inf. Sci. 247, 131-143 (2013). MSC: 03B52 03E72 03G25 PDFBibTeX XMLCite \textit{J. V. Riera} and \textit{J. Torrens}, Inf. Sci. 247, 131--143 (2013; Zbl 1321.03043) Full Text: DOI
Mas, M.; Monserrat, M.; Ruiz-Aguilera, D.; Torrens, J. An extension of the migrative property for uninorms. (English) Zbl 1320.68193 Inf. Sci. 246, 191-198 (2013). MSC: 68T37 03B52 PDFBibTeX XMLCite \textit{M. Mas} et al., Inf. Sci. 246, 191--198 (2013; Zbl 1320.68193) Full Text: DOI
Massanet, Sebastia; Mayor, Gaspar; Mesiar, Radko; Torrens, Joan On fuzzy implications: an axiomatic approach. (English) Zbl 1316.03032 Int. J. Approx. Reasoning 54, No. 9, 1471-1482 (2013). MSC: 03E72 03B52 PDFBibTeX XMLCite \textit{S. Massanet} et al., Int. J. Approx. Reasoning 54, No. 9, 1471--1482 (2013; Zbl 1316.03032) Full Text: DOI
Massanet, Sebastià; Torrens, Joan An overview of construction methods of fuzzy implications. (English) Zbl 1311.03053 Baczyński, Michał (ed.) et al., Advances in fuzzy implication functions. Berlin: Springer (ISBN 978-3-642-35676-6/hbk; 978-3-642-35677-3/ebook). Studies in Fuzziness and Soft Computing 300, 1-30 (2013). Reviewer: Esko Turunen (Wien) MSC: 03B52 PDFBibTeX XMLCite \textit{S. Massanet} and \textit{J. Torrens}, Stud. Fuzziness Soft Comput. 300, 1--30 (2013; Zbl 1311.03053) Full Text: DOI
Massanet, Sebastia; Torrens, Joan On the vertical threshold generation method of fuzzy implication and its properties. (English) Zbl 1284.68552 Fuzzy Sets Syst. 226, 32-52 (2013). MSC: 68T37 03B52 03E72 PDFBibTeX XMLCite \textit{S. Massanet} and \textit{J. Torrens}, Fuzzy Sets Syst. 226, 32--52 (2013; Zbl 1284.68552) Full Text: DOI
Massanet, Sebastia; Torrens, Joan Threshold generation method of construction of a new implication from two given ones. (English) Zbl 1254.03057 Fuzzy Sets Syst. 205, 50-75 (2012). MSC: 03B52 68T37 PDFBibTeX XMLCite \textit{S. Massanet} and \textit{J. Torrens}, Fuzzy Sets Syst. 205, 50--75 (2012; Zbl 1254.03057) Full Text: DOI
Massanet, Sebastia; Torrens, Joan On some properties of threshold generated implications. (English) Zbl 1254.03056 Fuzzy Sets Syst. 205, 30-49 (2012). MSC: 03B52 68T37 PDFBibTeX XMLCite \textit{S. Massanet} and \textit{J. Torrens}, Fuzzy Sets Syst. 205, 30--49 (2012; Zbl 1254.03056) Full Text: DOI
Massanet, Sebastia; Torrens, Joan On the characterization of Yager’s implications. (English) Zbl 1277.03021 Inf. Sci. 201, 1-18 (2012). Reviewer: Lidong Wang (Dalian) MSC: 03B52 68T37 PDFBibTeX XMLCite \textit{S. Massanet} and \textit{J. Torrens}, Inf. Sci. 201, 1--18 (2012; Zbl 1277.03021) Full Text: DOI
Massanet, Sebastia; Torrens, Joan Intersection of Yager’s implications with QL and D-implications. (English) Zbl 1258.03028 Int. J. Approx. Reasoning 53, No. 4, 467-479 (2012). Reviewer: Michał Baczyński (Katowice) MSC: 03B52 39B99 68T37 PDFBibTeX XMLCite \textit{S. Massanet} and \textit{J. Torrens}, Int. J. Approx. Reasoning 53, No. 4, 467--479 (2012; Zbl 1258.03028) Full Text: DOI
Riera, J. Vicente; Torrens, Joan Aggregation of subjective evaluations based on discrete fuzzy numbers. (English) Zbl 1238.68163 Fuzzy Sets Syst. 191, 21-40 (2012). MSC: 68T37 PDFBibTeX XMLCite \textit{J. V. Riera} and \textit{J. Torrens}, Fuzzy Sets Syst. 191, 21--40 (2012; Zbl 1238.68163) Full Text: DOI
Massanet, Sebastia; Torrens, Joan On a new class of fuzzy implications: \(h\)-implications and generalizations. (English) Zbl 1252.03060 Inf. Sci. 181, No. 11, 2111-2127 (2011). Reviewer: Lidong Wang (Dalian) MSC: 03B52 68T37 93C42 PDFBibTeX XMLCite \textit{S. Massanet} and \textit{J. Torrens}, Inf. Sci. 181, No. 11, 2111--2127 (2011; Zbl 1252.03060) Full Text: DOI
Massanet, Sebastia; Torrens, Joan The law of importation versus the exchange principle on fuzzy implications. (English) Zbl 1222.03028 Fuzzy Sets Syst. 168, No. 1, 47-69 (2011). Reviewer: Michał Baczyński (Katowice) MSC: 03B52 03E72 39B99 PDFBibTeX XMLCite \textit{S. Massanet} and \textit{J. Torrens}, Fuzzy Sets Syst. 168, No. 1, 47--69 (2011; Zbl 1222.03028) Full Text: DOI
Mas, M.; Monserrat, M.; Torrens, J. Smooth t-subnorms on finite scales. (English) Zbl 1231.03028 Fuzzy Sets Syst. 167, No. 1, 82-91 (2011). Reviewer: Radko Mesiar (Bratislava) MSC: 03B52 PDFBibTeX XMLCite \textit{M. Mas} et al., Fuzzy Sets Syst. 167, No. 1, 82--91 (2011; Zbl 1231.03028) Full Text: DOI
Massanet, Sebastià; Torrens, Joan Some remarks on the solutions to the functional equation \(I(x,y) = I(x,I(x,y))\) for D-operations. (English) Zbl 1207.03034 Hüllermeier, Eyke (ed.) et al., Information processing and management of uncertainty in knowledge-based systems. Theory and methods. 13th international conference, IPMU 2010, Dortmund, Germany, June 28–July 2, 2010. Proceedings. Part I. Berlin: Springer (ISBN 978-3-642-14054-9/pbk; 978-3-642-14055-6/ebook). Communications in Computer and Information Science 80, 666-675 (2010). MSC: 03B52 39B99 PDFBibTeX XMLCite \textit{S. Massanet} and \textit{J. Torrens}, Commun. Comput. Inf. Sci. 80, 666--675 (2010; Zbl 1207.03034) Full Text: DOI
Aguiló, I.; Suñer, J.; Torrens, J. A characterization of residual implications derived from left-continuous uninorms. (English) Zbl 1204.03028 Inf. Sci. 180, No. 20, 3992-4005 (2010). Reviewer: Michał Baczyński (Katowice) MSC: 03B52 03E72 39B99 PDFBibTeX XMLCite \textit{I. Aguiló} et al., Inf. Sci. 180, No. 20, 3992--4005 (2010; Zbl 1204.03028) Full Text: DOI
Carbonell, M.; Torrens, J. Continuous R-implications generated from representable aggregation functions. (English) Zbl 1204.03032 Fuzzy Sets Syst. 161, No. 17, 2276-2289 (2010). Reviewer: Michał Baczyński (Katowice) MSC: 03B52 03E72 39B99 PDFBibTeX XMLCite \textit{M. Carbonell} and \textit{J. Torrens}, Fuzzy Sets Syst. 161, No. 17, 2276--2289 (2010; Zbl 1204.03032) Full Text: DOI
Mas, M.; Monserrat, M.; Torrens, J. A characterization of (U,N), RU, QL and D-implications derived from uninorms satisfying the law of importation. (English) Zbl 1195.03031 Fuzzy Sets Syst. 161, No. 10, 1369-1387 (2010). Reviewer: Michał Baczyński (Katowice) MSC: 03B52 03E72 39B99 PDFBibTeX XMLCite \textit{M. Mas} et al., Fuzzy Sets Syst. 161, No. 10, 1369--1387 (2010; Zbl 1195.03031) Full Text: DOI
Mas, M.; Monserrat, M.; Torrens, J. The law of importation for discrete implications. (English) Zbl 1187.03023 Inf. Sci. 179, No. 24, 4208-4218 (2009). MSC: 03B52 68T37 PDFBibTeX XMLCite \textit{M. Mas} et al., Inf. Sci. 179, No. 24, 4208--4218 (2009; Zbl 1187.03023) Full Text: DOI
Mas, M.; Monserrat, M.; Torrens, J. Two types of implications derived from uninorms. (English) Zbl 1125.03018 Fuzzy Sets Syst. 158, No. 23, 2612-2626 (2007). Reviewer: Vilém Novák (Ostrava) MSC: 03B52 68T37 PDFBibTeX XMLCite \textit{M. Mas} et al., Fuzzy Sets Syst. 158, No. 23, 2612--2626 (2007; Zbl 1125.03018) Full Text: DOI
Mas, M.; Mesiar, R.; Monserrat, M.; Torrens, J. Aggregation operators with annihilator. (English) Zbl 1081.68107 Int. J. Gen. Syst. 34, No. 1, 17-38 (2005). Reviewer: Siegfried J. Gottwald (Leipzig) MSC: 68T37 26B99 PDFBibTeX XMLCite \textit{M. Mas} et al., Int. J. Gen. Syst. 34, No. 1, 17--38 (2005; Zbl 1081.68107) Full Text: DOI
Mas, M.; Mayor, G.; Torrens, J. t-operators. (English) Zbl 1087.03515 Int. J. Uncertain. Fuzziness Knowl.-Based Syst. 7, No. 1, 31-50 (1999). MSC: 03E72 PDFBibTeX XMLCite \textit{M. Mas} et al., Int. J. Uncertain. Fuzziness Knowl.-Based Syst. 7, No. 1, 31--50 (1999; Zbl 1087.03515) Full Text: DOI