@article{CTGDC_1987__28_3_197_0,
     author = {Bourn, Dominique},
     title = {The shift functor and the comprehensive factorization for internal groupoids},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {197--226},
     year = {1987},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {28},
     number = {3},
     mrnumber = {923629},
     zbl = {0655.18007},
     language = {en},
     url = {https://www.numdam.org/item/CTGDC_1987__28_3_197_0/}
}