Fechete, Dorina; Fechete, Ioan Quotient algebraic structures on the set of fuzzy numbers. (English) Zbl 1349.22001 Kybernetika 51, No. 2, 255-267 (2015). MSC: 22A15 03E72 PDFBibTeX XMLCite \textit{D. Fechete} and \textit{I. Fechete}, Kybernetika 51, No. 2, 255--267 (2015; Zbl 1349.22001) Full Text: DOI Link
Birtea, Petre; Ortega, Juan-Pablo; Ratiu, Tudor S. Openness and convexity for momentum maps. (English) Zbl 1163.53053 Trans. Am. Math. Soc. 361, No. 2, 603-630 (2009). Reviewer: Ioan Pop (Iaşi) MSC: 53D20 22E70 37J15 58B25 PDFBibTeX XMLCite \textit{P. Birtea} et al., Trans. Am. Math. Soc. 361, No. 2, 603--630 (2009; Zbl 1163.53053) Full Text: DOI arXiv