@article{CTGDC_2008__49_3_176_0,
     author = {Bourn, Dominique},
     title = {The {Mal'tsev} operation on extensions},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {176--195},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {49},
     number = {3},
     year = {2008},
     mrnumber = {2449672},
     zbl = {1166.18002},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_2008__49_3_176_0/}
}