@article{DAN_1977_235_3_a0,
     author = {M. G. Gasymov},
     title = {On the solvability of boundary value problems for a class of operator differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {505--508},
     publisher = {mathdoc},
     volume = {235},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_235_3_a0/}
}