@article{CTGDC_1990__31_4_277_0,
     author = {Korkes, F. J. and Porter, T.},
     title = {Nilpotent crossed modules and pro-$C$ completions},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {277--282},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {31},
     number = {4},
     year = {1990},
     mrnumber = {1109369},
     zbl = {0729.55007},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1990__31_4_277_0/}
}