@article{VMUMM_2001_1_a0,
     author = {A. N. Bobrov},
     title = {Spectral properties of some two-dimensional boundary value problems},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {3--6},
     publisher = {mathdoc},
     number = {1},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2001_1_a0/}
}