@article{DAN_1974_219_5_a5,
     author = {I. L. Vulis},
     title = {Spectral asymptotics of degenerate polyharmonic operators},
     journal = {Doklady Akademii Nauk},
     pages = {1049--1052},
     publisher = {mathdoc},
     volume = {219},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_219_5_a5/}
}