@article{FAA_1987_21_2_a0,
     author = {O. A. Veliev},
     title = {Asymptotic formulas for the eigenvalues of a periodic {Schr\"odinger} operator and the {Bethe{\textendash}Sommerfeld} conjecture},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {1--15},
     year = {1987},
     volume = {21},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_2_a0/}
}