no. 3
An isomorphic characterization of the Schmidt class
Compositio Mathematica, Tome 30 (1975) no. 3, pp. 293-297. 
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     author = {Lewis, D. R.},
     title = {An isomorphic characterization of the {Schmidt} class},
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     zbl = {0321.46017},
     mrnumber = {374968},
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     url = {http://www.numdam.org/item/CM_1975__30_3_293_0/}
}
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Lewis, D. R. An isomorphic characterization of the Schmidt class. Compositio Mathematica, Tome 30 (1975) no. 3, pp. 293-297. http://www.numdam.org/item/CM_1975__30_3_293_0/

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