@article{IVM_1976_2_a10,
     author = {N. I. Shkil'},
     title = {Periodic solutions of systems of linear differential equations with slowly varying coefficients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {79--91},
     publisher = {mathdoc},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1976_2_a10/}
}