%0 Journal Article %T News and Notices %J Czechoslovak Mathematical Journal %D 1961 %V 11 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1961.100490/ %R 10.21136/CMJ.1961.100490 %G en %F 10_21136_CMJ_1961_100490