@article{CTGDC_1972__13_4_357_0, author = {Barr, Michael}, title = {The point of the empty set}, journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle}, pages = {357--368}, publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS}, volume = {13}, number = {4}, year = {1972}, mrnumber = {323861}, zbl = {0258.18003}, language = {en}, url = {http://archive.numdam.org/item/CTGDC_1972__13_4_357_0/} }
TY - JOUR AU - Barr, Michael TI - The point of the empty set JO - Cahiers de topologie et géométrie différentielle PY - 1972 SP - 357 EP - 368 VL - 13 IS - 4 PB - Dunod éditeur, publié avec le concours du CNRS UR - http://archive.numdam.org/item/CTGDC_1972__13_4_357_0/ LA - en ID - CTGDC_1972__13_4_357_0 ER -
Barr, Michael. The point of the empty set. Cahiers de topologie et géométrie différentielle, Tome 13 (1972) no. 4, pp. 357-368. http://archive.numdam.org/item/CTGDC_1972__13_4_357_0/
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