%0 Journal Article %T Summaries of articles published in this issue %J Czechoslovak Mathematical Journal %D 1977 %P 673-678 %V 27 %N 4 %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1977.101505/ %R 10.21136/CMJ.1977.101505 %G en %F 10_21136_CMJ_1977_101505