%0 Journal Article %T Recense %J Applications of Mathematics %D 1959 %P 156-161 %V 4 %N 2 %U http://geodesic.mathdoc.fr/articles/10.21136/AM.1959.102657/ %R 10.21136/AM.1959.102657 %G cs %F 10_21136_AM_1959_102657