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@article{MZ_1977__155_172560, author = {Heinz-Willi Goelden}, title = {On {Non-Degeneracy} of the {Ground} {State} of {Schr\"odinger} {Operators.}}, journal = {Mathematische Zeitschrift}, pages = {239--248}, publisher = {mathdoc}, volume = {155}, year = {1977}, zbl = {0353.35032}, url = {http://geodesic.mathdoc.fr/item/MZ_1977__155_172560/} }
Heinz-Willi Goelden. On Non-Degeneracy of the Ground State of Schrödinger Operators.. Mathematische Zeitschrift, Tome 155 (1977), pp. 239-248. http://geodesic.mathdoc.fr/item/MZ_1977__155_172560/