%0 Journal Article %A Hofmann, Karl Heinrich %A Mostert, Paul S. %T Connected extensions of simple semigroups %J Czechoslovak Mathematical Journal %D 1965 %P 295-298 %V 15 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1965.100671/ %R 10.21136/CMJ.1965.100671 %G en %F 10_21136_CMJ_1965_100671