@article{CTGDC_1989__30_3_229_0,
     author = {Pradines, Jean},
     title = {Morphisms between spaces of leaves viewed as fractions},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {229--246},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {30},
     number = {3},
     year = {1989},
     mrnumber = {1029626},
     zbl = {0686.57013},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1989__30_3_229_0/}
}