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16A63 

• Trlifaj, Jan: Ext and von Neumann regular rings. (English). Czechoslovak Mathematical Journal, vol. 35 (1985), issue 2, pp. 324-332
• Bican, Ladislav; Jirásko, Josef: A general concept of the pseudoprojective module. (English). Czechoslovak Mathematical Journal, vol. 34 (1984), issue 1, pp. 64-83
• Jirásko, Josef: Preradicals and generalizations of $QF$-$3'$ modules. I. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 1, pp. 25-40
• Jirásko, Josef: Preradicals and generalizations of $QF$-$3'$ modules. II. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 2, pp. 269-284
• Jirásko, Josef: Generalized projectivity. II. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 20 (1979), issue 3, pp. 483-499
• Jirásko, Josef: Pseudohereditary and pseudocohereditary preradicals. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 20 (1979), issue 2, pp. 317-327