%0 Journal Article %A M. Altman %T A general maximum principle for optimization problems %J Studia Mathematica %D 1968 %P 319-329 %V 31 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-31-4-319-329/ %R 10.4064/sm-31-4-319-329 %G en %F 10_4064_sm_31_4_319_329