Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MM2_1974__14_154285, author = {Wilhelm Singhof}, title = {\"Uber nichtlineare {Spektral-} und {St\"orungstheorie.}}, journal = {Manuscripta mathematica}, pages = {123--162}, publisher = {mathdoc}, volume = {14}, year = {1974}, zbl = {0295.47064}, url = {http://geodesic.mathdoc.fr/item/MM2_1974__14_154285/} }
Wilhelm Singhof. Über nichtlineare Spektral- und Störungstheorie.. Manuscripta mathematica, Tome 14 (1974), pp. 123-162. http://geodesic.mathdoc.fr/item/MM2_1974__14_154285/