General associativity and general composition for double categories
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Volume 34 (1993) no. 1, p. 57-79 
@article{CTGDC_1993__34_1_57_0,
     author = {Dawson, Robert J. MacG. and Pare, Robert},
     title = {General associativity and general composition for double categories},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {34},
     number = {1},
     year = {1993},
     pages = {57-79},
     zbl = {0778.18005},
     mrnumber = {1213297},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1993__34_1_57_0}
}

Dawson, Robert; Pare, Robert. General associativity and general composition for double categories. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Volume 34 (1993) no. 1, pp. 57-79. http://www.numdam.org/item/CTGDC_1993__34_1_57_0/

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