@article{UZMU_1952_163_163_a7,
     author = {B. P. Demidovich},
     title = {On some properties of the characteristic exponents of a system of ordinary linear differential equations with periodic coefficients},
     journal = {Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta},
     pages = {123--132},
     publisher = {mathdoc},
     volume = {163},
     number = {163},
     year = {1952},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZMU_1952_163_163_a7/}
}