%0 Journal Article %T Summaries of articles published in this issue %J Czechoslovak Mathematical Journal %D 1970 %P -719 %V 20 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100994/ %R 10.21136/CMJ.1970.100994 %G en %F 10_21136_CMJ_1970_100994