@article{CTGDC_1987__28_2_89_0,
     author = {Golasi\'nski, Marek},
     title = {Homotopy groups of small categories and derived functors},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {89--97},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {28},
     number = {2},
     year = {1987},
     mrnumber = {913965},
     zbl = {0661.18006},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1987__28_2_89_0/}
}