%0 Journal Article %A Albrecht, Ulrich F. %T Extension functors on the category of $A$-solvable abelian groups %J Czechoslovak Mathematical Journal %D 1991 %P 685-694 %V 41 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1991.102499/ %R 10.21136/CMJ.1991.102499 %G en %F 10_21136_CMJ_1991_102499