@article{1250131068, author = {Bohl, Erich}, title = {Zur theorie $P$-beschr\"ankter Operatoren}, journal = {Rocky Mountain J. Math.}, volume = {4}, number = {4}, year = {1974}, pages = { 31-40}, language = {en}, url = {http://dml.mathdoc.fr/item/1250131068} }
Bohl, Erich. Zur theorie $P$-beschränkter Operatoren. Rocky Mountain J. Math., Tome 4 (1974) no. 4, pp. 31-40. http://gdmltest.u-ga.fr/item/1250131068/