@article{MZM_1984_36_5_a7,
     author = {F. S. Rofe-Beketov and A. M. Khol'kin},
     title = {A fundamental system of solutions for an operator differential equation with a boundary condition at infinity},
     journal = {Matemati\v{c}eskie zametki},
     pages = {697--709},
     year = {1984},
     volume = {36},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1984_36_5_a7/}
}