@article{GDZPPN00221928X,
title = {Bemerkungen \"uber nichtlineare St\"orungen von Schr\"odinger Operatoren.},
journal = {Manuscripta mathematica},
volume = {17},
year = {1975},
pages = {187-204},
zbl = {0323.35031},
url = {http://dml.mathdoc.fr/item/GDZPPN00221928X}
}
Leinfelder, H.; Simader, Ch.G. Bemerkungen über nichtlineare Störungen von Schrödinger Operatoren.. Manuscripta mathematica, Tome 17 (1975) pp. 187-204. http://gdmltest.u-ga.fr/item/GDZPPN00221928X/