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@article{MZ_1966__94_170631, author = {Heinz-Dieter Niessen}, title = {Algebraische {Untersuchungen} \"uber separierbare {Operatoren.}}, journal = {Mathematische Zeitschrift}, pages = {328--348}, publisher = {mathdoc}, volume = {94}, year = {1966}, zbl = {0149.07603}, url = {http://geodesic.mathdoc.fr/item/MZ_1966__94_170631/} }
Heinz-Dieter Niessen. Algebraische Untersuchungen über separierbare Operatoren.. Mathematische Zeitschrift, Tome 94 (1966), pp. 328-348. http://geodesic.mathdoc.fr/item/MZ_1966__94_170631/