@article{RM_1961_16_2_a18,
     author = {L. R. Volevich},
     title = {Regularity of solutions of systems of differential equations with variable coefficients},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1961_16_2_a18/}
}