@article{GDZPPN00227745X, title = {Zur Theorie linearer Operatoren}, journal = {Mathematische Annalen}, volume = {111}, year = {1935}, pages = {722-725}, language = {de}, url = {http://dml.mathdoc.fr/item/GDZPPN00227745X} }
Wecken, F.J. Zur Theorie linearer Operatoren. Mathematische Annalen, Tome 111 (1935) pp. 722-725. http://gdmltest.u-ga.fr/item/GDZPPN00227745X/