@article{CTGDC_2010__51_2_83_0, author = {Vitale, Enrico M.}, title = {Bipullbacks and calculus of fractions}, journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques}, volume = {51}, year = {2010}, pages = {83-113}, mrnumber = {2667978}, zbl = {1226.18006}, language = {en}, url = {http://dml.mathdoc.fr/item/CTGDC_2010__51_2_83_0} }
Vitale, Enrico M. Bipullbacks and calculus of fractions. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 51 (2010) pp. 83-113. http://gdmltest.u-ga.fr/item/CTGDC_2010__51_2_83_0/
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