@article{MZM_1989_45_5_a6,
     author = {L. B. Parnovskii},
     title = {Asymptotics of the discrete spectrum of the {Dirichlet} and {Neumann} problems on the fundamental domain of the crystallographic group},
     journal = {Matemati\v{c}eskie zametki},
     pages = {63--69},
     publisher = {mathdoc},
     volume = {45},
     number = {5},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_45_5_a6/}
}