Ordered groupoids and étendues
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 45 (2004) no. 2, pp. 82-108.
@article{CTGDC_2004__45_2_82_0,
     author = {Lawson, Mark V. and Steinberg, Benjamin},
     title = {Ordered groupoids and \'etendues},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {82--108},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {45},
     number = {2},
     year = {2004},
     zbl = {1060.18002},
     mrnumber = {2072933},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_2004__45_2_82_0/}
}
Lawson, Mark V.; Steinberg, Benjamin. Ordered groupoids and étendues. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 45 (2004) no. 2, pp. 82-108. http://www.numdam.org/item/CTGDC_2004__45_2_82_0/

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