1. Rings and Categories of Modules;Anderson,1974
2. Krull–Schmidt fails for serial modules;Facchini;Trans. Amer. Math. Soc.,1996
3. A. Facchini, D. Herbera, I. Sakhajev, Finitely Generated Flat Modules and a Characterization of Semiperfect Rings, in preparation
4. A counterexample to two hypotheses on projective and flat modules;Gerasimov;Siberian Mat. Zh.,1984
5. Lifting idempotents and exchange rings;Nicholson;Trans. Amer. Math. Soc.,1977