Colimits in free categories
Diagrammes, Tome 37 (1997), pp. 3-12. 
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     author = {Ehresmann, Andr\'ee},
     title = {Colimits in free categories},
     journal = {Diagrammes},
     pages = {3--12},
     publisher = {Universit\'e Paris 7, Unit\'e d'enseignement et de recherche de math\'ematiques},
     volume = {37},
     year = {1997},
     zbl = {0919.18002},
     mrnumber = {1677068},
     language = {en},
     url = {http://www.numdam.org/item/DIA_1997__37__3_0/}
}
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Ehresmann, Andrée C. Colimits in free categories. Diagrammes, Tome 37 (1997), pp. 3-12. http://www.numdam.org/item/DIA_1997__37__3_0/

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