This publication is cited in the following articles:
Ya. A. Kopylov, “On the homology sequence in a $P$-semi-abelian category”, Sib. elektron. matem. izv., 9 (2012), 190–200
Yaroslav A. Kopylov, “The Two-Square Lemma and the connecting morphism in a preabelian category”, Zhurn. SFU. Ser. Matem. i fiz., 5:3 (2012), 316–325
Ya. A. Kopylov, V. I. Kuz'minov, “The Ker-Coker-sequence and its generalization in some classes of additive categories”, Siberian Math. J., 50:1 (2009), 86–95
Ya. A. Kopylov, “The five- and nine-lemmas in P-semi-abelian categories”, Siberian Math. J., 50:5 (2009), 867–873