@article{1077311201,
author = {Faris, William and Simon, Barry},
title = {Degenerate and non-degenerate ground states for
Schr\"odinger operators},
journal = {Duke Math. J.},
volume = {42},
number = {1},
year = {1975},
pages = { 559-567},
language = {en},
url = {http://dml.mathdoc.fr/item/1077311201}
}
Faris, William; Simon, Barry. Degenerate and non-degenerate ground states for
Schrödinger operators. Duke Math. J., Tome 42 (1975) no. 1, pp. 559-567. http://gdmltest.u-ga.fr/item/1077311201/