@article{FAA_2019_53_1_a3,
     author = {A. V. Il'ina and I. M. Krichever and N. A. Nekrasov},
     title = {Two-dimensional periodic {Schr\"odinger} operators integrable on an energy ``eigenlevel''},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {31--48},
     publisher = {mathdoc},
     volume = {53},
     number = {1},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2019_53_1_a3/}
}