@article{SM_1971_15_1_a3,
     author = {V. N. Tulovskii},
     title = {On the asymptotic distribution of the eigenvalues of degenerating elliptic equations of second order},
     journal = {Sbornik. Mathematics},
     pages = {75--87},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_15_1_a3/}
}