@article{MZM_1998_64_5_a2,
     author = {V. Sh. Burd and V. A. Karakulin},
     title = {On the asymptotic integration of systems of linear differential equations with oscillatory decreasing coefficients},
     journal = {Matemati\v{c}eskie zametki},
     pages = {658--666},
     publisher = {mathdoc},
     volume = {64},
     number = {5},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_64_5_a2/}
}