@article{MZ_1987__194_173849,
     author = {Giuseppe Tomassini},
     title = {Extensions d'objets {CR.}},
     journal = {Mathematische Zeitschrift},
     pages = {471--486},
     publisher = {mathdoc},
     volume = {194},
     year = {1987},
     zbl = {0629.32015},
     url = {http://geodesic.mathdoc.fr/item/MZ_1987__194_173849/}
}