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Author: Albrecht, Ulrich F.

• Albrecht, Ulrich F.: Extension functors on the category of $A$-solvable abelian groups. (English). Czechoslovak Mathematical Journal, vol. 41 (1991), issue 4, pp. 685-694
• Albrecht, Ulrich F.; Hill, Paul: Butler groups of infinite rank and axiom 3. (English). Czechoslovak Mathematical Journal, vol. 37 (1987), issue 2, pp. 293-309