%0 Journal Article %T Summaries of articles published in this issue %J Czechoslovak Mathematical Journal %D 1968 %V 18 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1968.100855/ %R 10.21136/CMJ.1968.100855 %G en %F 10_21136_CMJ_1968_100855