@article{DAN_1972_206_4_a8,
     author = {M. G. Lyubarskii},
     title = {The extension of {Favard{\textquoteright}s} theory to the case of a system of linear differential equations whose coefficients are unbounded and almost periodic in the sense of {Levitan}},
     journal = {Doklady Akademii Nauk},
     pages = {808--810},
     publisher = {mathdoc},
     volume = {206},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_206_4_a8/}
}