@article{MZM_2011_90_5_a3,
     author = {M. K. Balaev},
     title = {Solvability of the {Cauchy} {Problem} for {Linear} {Operator-Differential} {Equations} with {Variable} {Operator} {Coefficients}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {672--688},
     publisher = {mathdoc},
     volume = {90},
     number = {5},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2011_90_5_a3/}
}