@article{DAN_1973_213_6_a1,
     author = {V. P. Glushko and Hoang Hien \v{S}in'},
     title = {On the completeness of the generalized eigenfunctions of a degenerate differential operator of second order},
     journal = {Doklady Akademii Nauk},
     pages = {1237--1239},
     publisher = {mathdoc},
     volume = {213},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_213_6_a1/}
}