@article{IM2_2012_76_1_a5,
     author = {I. N. Sergeev},
     title = {Oscillation and wandering characteristics of solutions of a~linear differential system},
     journal = {Izvestiya. Mathematics },
     pages = {139--162},
     publisher = {mathdoc},
     volume = {76},
     number = {1},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2012_76_1_a5/}
}