%0 Journal Article %A Lewis, D. R. %T An isomorphic characterization of the Schmidt class %J Compositio Mathematica %D 1975 %P 293-297 %V 30 %N 3 %I Noordhoff International Publishing %U http://www.numdam.org/item/CM_1975__30_3_293_0/ %G en %F CM_1975__30_3_293_0