%0 Journal Article %T Summaries of articles published in this issue %J Czechoslovak Mathematical Journal %D 1980 %P 171 %V 30 %N 2 %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1980.101669/ %R 10.21136/CMJ.1980.101669 %G en %F 10_21136_CMJ_1980_101669