@article{ZNSL_1991_195_a5,
     author = {E. L. Korotyaev},
     title = {On some properties of quasimomentum of one-dimensional {Hill} operator},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {48--57},
     publisher = {mathdoc},
     volume = {195},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_195_a5/}
}