@article{SJIM_2013_16_4_a3,
     author = {G. V. Demidenko},
     title = {Systems of differential equations with periodic coefficients},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {38--46},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2013_16_4_a3/}
}