%0 Journal Article %T Announcement. [Czechoslovak Mathematical Journal typeset in TeX] %J Czechoslovak Mathematical Journal %D 1991 %V 41 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1991.102508/ %R 10.21136/CMJ.1991.102508 %G en %F 10_21136_CMJ_1991_102508