@article{DAN_1971_201_5_a4,
     author = {M. L. Gorbachuk and A. N. Kochubei},
     title = {Selfadjoint boundary value problems for certain classes of differential- operator equations of higher order},
     journal = {Doklady Akademii Nauk},
     pages = {1029--1032},
     publisher = {mathdoc},
     volume = {201},
     number = {5},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_201_5_a4/}
}