no. 2
Abstract homotopy theory in procategories
Cahiers de topologie et géométrie différentielle, Tome 17 (1976) no. 2, pp. 113-124. 
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     author = {Porter, Timothy},
     title = {Abstract homotopy theory in procategories},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {113--124},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {17},
     number = {2},
     year = {1976},
     mrnumber = {445496},
     zbl = {0349.18012},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1976__17_2_113_0/}
}
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Porter, Timothy. Abstract homotopy theory in procategories. Cahiers de topologie et géométrie différentielle, Tome 17 (1976) no. 2, pp. 113-124. http://archive.numdam.org/item/CTGDC_1976__17_2_113_0/

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