@article{ZNSL_1981_104_a16,
     author = {V. E. Nomofilov},
     title = {Asymptotic solutions of the second order system of differential equations concentrated in a~vicinity of a~ray},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {170--179},
     publisher = {mathdoc},
     volume = {104},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a16/}
}