%0 Journal Article %A W. Bach %T A solution of the problem of four limits %J Annales Polonici Mathematici %D 1964 %P 57-76 %V 15 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-15-1-57-76/ %R 10.4064/ap-15-1-57-76 %G en %F 10_4064_ap_15_1_57_76