@article{CTGDC_1971__12_4_445_0,
     author = {Michalowicz, J. V.},
     title = {Diagram lemmas in semi-exact $JTK$-categories},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {445--467},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {12},
     number = {4},
     year = {1971},
     mrnumber = {304458},
     zbl = {0237.18004},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1971__12_4_445_0/}
}