1. B. Davvaz and Y. A. Parnian-Garamaleky, Bull. Malaysian Math. Soc. 22, 53–56 (1999).
2. S. M. Anvanriyeh and B. Davvaz, Far East J. Math. Sci. 4, 209–219 (2002).
3. A GENERALIZATION OF HOMOLOGICAL ALGEBRA
4. ON QUASI-EXACT SEQUENCES
5. A. Madanshekaf, Iran. J. Math. Sci. Informatics 3, 49–53 (2008).