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@article{MZ_1980__173_172979, author = {Herbert Leinfelder}, title = {W\"ust's {Theorem} and {Positively} {Perturbed} {Schr\"odinger} {Operators.}}, journal = {Mathematische Zeitschrift}, pages = {195--198}, publisher = {mathdoc}, volume = {173}, year = {1980}, zbl = {0436.35027}, url = {http://geodesic.mathdoc.fr/item/MZ_1980__173_172979/} }
Herbert Leinfelder. Wüst's Theorem and Positively Perturbed Schrödinger Operators.. Mathematische Zeitschrift, Tome 173 (1980), pp. 195-198. http://geodesic.mathdoc.fr/item/MZ_1980__173_172979/