@article{DAN_1976_228_5_a1,
     author = {V. I. Gorbachuk and M. L. Gorbachuk},
     title = {On the boundary values of solutions of homogeneous differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1021--1024},
     publisher = {mathdoc},
     volume = {228},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_5_a1/}
}