no. 2
Homotopy groups of small categories and derived functors
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 28 (1987) no. 2, pp. 89-97. 
@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://www.numdam.org/item/CTGDC_1987__28_2_89_0/}
}
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Golasiński, Marek. Homotopy groups of small categories and derived functors. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 28 (1987) no. 2, pp. 89-97. http://www.numdam.org/item/CTGDC_1987__28_2_89_0/

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