@article{1183533492, author = {Howland, James S.}, title = {Perturbation of embedded eigenvalues}, journal = {Bull. Amer. Math. Soc.}, volume = {78}, number = {4}, year = {1972}, pages = { 280-283}, language = {en}, url = {http://dml.mathdoc.fr/item/1183533492} }
Howland, James S. Perturbation of embedded eigenvalues. Bull. Amer. Math. Soc., Tome 78 (1972) no. 4, pp. 280-283. http://gdmltest.u-ga.fr/item/1183533492/