@article{SM_2017_208_10_a6,
     author = {D. V. Nekhaev and A. I. Shafarevich},
     title = {A~quasiclassical limit of the spectrum of {a~Schr\"odinger} operator with complex periodic potential},
     journal = {Sbornik. Mathematics},
     pages = {1535--1556},
     publisher = {mathdoc},
     volume = {208},
     number = {10},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2017_208_10_a6/}
}