TY - JOUR AU - Albrecht, Ulrich F. TI - Extension functors on the category of $A$-solvable abelian groups JO - Czechoslovak Mathematical Journal PY - 1991 SP - 685 EP - 694 VL - 41 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1991.102499/ DO - 10.21136/CMJ.1991.102499 LA - en ID - 10_21136_CMJ_1991_102499 ER -