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@article{CM_1975__30_3_293_0, author = {Lewis, D. R.}, title = {An isomorphic characterization of the {Schmidt} class}, journal = {Compositio Mathematica}, pages = {293--297}, publisher = {Noordhoff International Publishing}, volume = {30}, number = {3}, year = {1975}, mrnumber = {374968}, zbl = {0321.46017}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1975__30_3_293_0/} }
Lewis, D. R. An isomorphic characterization of the Schmidt class. Compositio Mathematica, Tome 30 (1975) no. 3, pp. 293-297. http://geodesic.mathdoc.fr/item/CM_1975__30_3_293_0/