@article{05875569, title = {The five- and nine-lemmas in P-semi-abelian categories.}, journal = {Sibirskij Matematicheskij Zhurnal}, volume = {50}, year = {2009}, pages = {1097-1104}, zbl = {1224.18009}, language = {en}, url = {http://dml.mathdoc.fr/item/05875569} }
Kopylov, Ya.A. The five- and nine-lemmas in P-semi-abelian categories.. Sibirskij Matematicheskij Zhurnal, Tome 50 (2009) pp. 1097-1104. http://gdmltest.u-ga.fr/item/05875569/