@article{IIMI_2002_26_3_a0,
     author = {L. I. Danilov},
     title = {On the spectra of two-dimensional periodic {Schr\"odinger} and {Dirac} operators},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {3--98},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2002_26_3_a0/}
}