Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MOMA_1970__74_177524, author = {Erwin Kreyszig}, title = {Bergman-Operatoren der {Klasse} {P.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {437--444}, publisher = {mathdoc}, volume = {74}, year = {1970}, language = {de}, url = {http://geodesic.mathdoc.fr/item/MOMA_1970__74_177524/} }
Erwin Kreyszig. Bergman-Operatoren der Klasse P.. Monatshefte für Mathematik, Tome 74 (1970), pp. 437-444. http://geodesic.mathdoc.fr/item/MOMA_1970__74_177524/