@article{DAN_1994_336_3_a6,
     author = {P. P. Kargaev and E. L. Korotyaev},
     title = {Effective masses for the {Hill} operator, and conformal mappings},
     journal = {Doklady Akademii Nauk},
     pages = {312--315},
     publisher = {mathdoc},
     volume = {336},
     number = {3},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_336_3_a6/}
}