%0 Journal Article %T Communication. [EQUADIFF III Announcement] %J Czechoslovak Mathematical Journal %D 1972 %P 352 %V 22 %N 2 %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1972.101103/ %R 10.21136/CMJ.1972.101103 %G en %F 10_21136_CMJ_1972_101103