@article{DAN_1976_230_6_a0,
     author = {M. A. Atakhodzhaev},
     title = {On a linear differential equation of fourth order in {Hilbert} space},
     journal = {Doklady Akademii Nauk},
     pages = {1265--1266},
     publisher = {mathdoc},
     volume = {230},
     number = {6},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_6_a0/}
}