@article{DAN_1967_174_6_a4,
     author = {S. I. Grinberg},
     title = {Certain asymptotic formulas for the spectra of the third boundary value problem, associated with the variation of a function which enters into the boundary condition},
     journal = {Doklady Akademii Nauk},
     pages = {1253--1256},
     publisher = {mathdoc},
     volume = {174},
     number = {6},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_174_6_a4/}
}