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@article{MAN_1970__184_161921, author = {S.K. BERBERIAN}, title = {Some {Conditions} on an {Operator} {Implying} {Normality.}}, journal = {Mathematische Annalen}, pages = {188--192}, publisher = {mathdoc}, volume = {184}, year = {1970}, zbl = {0176.11301}, url = {http://geodesic.mathdoc.fr/item/MAN_1970__184_161921/} }
S.K. BERBERIAN. Some Conditions on an Operator Implying Normality.. Mathematische Annalen, Tome 184 (1970), pp. 188-192. http://geodesic.mathdoc.fr/item/MAN_1970__184_161921/