@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/