Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1990_188_a4, author = {Yu. E. Karpeshina}, title = {Perturbation theory for the {Schr\"odinger} operator with periodic potential}, journal = {Informatics and Automation}, pages = {88--116}, publisher = {mathdoc}, volume = {188}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1990_188_a4/} }
Yu. E. Karpeshina. Perturbation theory for the Schr\"odinger operator with periodic potential. Informatics and Automation, Boundary value problems of mathematical physics. Part 14, Tome 188 (1990), pp. 88-116. http://geodesic.mathdoc.fr/item/TRSPY_1990_188_a4/