Portugal, L. F.; Resende, M. G. C.; Veiga, G.; Patrício, J.; Júdice, J. J. Fortran subroutines for network flow optimization using an interior point algorithm. (English. Portuguese summary) Zbl 1257.90107 Pesqui. Oper. 28, No. 2, 243-261 (2008). MSC: 90C35 90C51 90-04 PDFBibTeX XMLCite \textit{L. F. Portugal} et al., Pesqui. Oper. 28, No. 2, 243--261 (2008; Zbl 1257.90107) Full Text: DOI Link
Portugal, L. F.; Resende, M. G. C.; Veiga, G.; Júdice, J. J. A truncated primal-infeasible dual-feasible network interior point method. (English) Zbl 0957.90022 Networks 35, No. 2, 91-108 (2000). MSC: 90B10 90C51 90C05 90C53 PDFBibTeX XMLCite \textit{L. F. Portugal} et al., Networks 35, No. 2, 91--108 (2000; Zbl 0957.90022) Full Text: DOI
Portugal, L.; Júdice, J. A hybrid algorithm for the solution of a single commodity spatial equilibrium model. (English) Zbl 0854.90136 Comput. Oper. Res. 23, No. 7, 623-639 (1996). MSC: 90C33 91D25 90C90 PDFBibTeX XMLCite \textit{L. Portugal} and \textit{J. Júdice}, Comput. Oper. Res. 23, No. 7, 623--639 (1996; Zbl 0854.90136) Full Text: DOI
Portugal, Luís F.; Júdice, Joaquim J.; Vicente, Luís N. A comparison of block pivoting and interior-point algorithms for linear least squares problems with nonnegative variables. (English) Zbl 0812.90124 Math. Comput. 63, No. 208, 625-643 (1994). MSC: 90C20 65F50 90C06 PDFBibTeX XMLCite \textit{L. F. Portugal} et al., Math. Comput. 63, No. 208, 625--643 (1994; Zbl 0812.90124) Full Text: DOI