@article{DE_1996_32_3_a5,
     author = {A. V. Lipnitskii},
     title = {An estimate for the characteristic exponents of the {Hill} equation with a periodic coefficient},
     journal = {Differencialʹnye uravneni\^a},
     pages = {323--327},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_3_a5/}
}