@article{DAN_1975_221_2_a0,
     author = {K. Kh. Boimatov},
     title = {The distribution of eigenvalues of elliptic operators},
     journal = {Doklady Akademii Nauk},
     pages = {265--268},
     year = {1975},
     volume = {221},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_221_2_a0/}
}