@article{MM2_1982__38_154862,
     author = {M.P. Fourman and A. Scedrov},
     title = {The },
     journal = {Manuscripta mathematica},
     pages = {325--332},
     publisher = {mathdoc},
     volume = {38},
     year = {1982},
     zbl = {0499.03048},
     url = {http://geodesic.mathdoc.fr/item/MM2_1982__38_154862/}
}