Bipullbacks and calculus of fractions
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 51 (2010) no. 2, article no. 1, 31 p. 
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     author = {Vitale, Enrico M.},
     title = {Bipullbacks and calculus of fractions},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     eid = {1},
     pages = {83--113},
     publisher = {Andr\'ee CHARLES EHRESMANN},
     volume = {51},
     number = {2},
     year = {2010},
     mrnumber = {2667978},
     zbl = {1226.18006},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_2010__51_2_83_0/}
}
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Vitale, Enrico M. Bipullbacks and calculus of fractions. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 51 (2010) no. 2, article  no. 1, 31 p. http://archive.numdam.org/item/CTGDC_2010__51_2_83_0/

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