@article{TM_1980_147_a4,
     author = {S. Karimov},
     title = {Asymptotics of solutions of a~class of differential equations with a~small parameter multiplying the derivative in the case of change of stability of a~focus},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {57--64},
     publisher = {mathdoc},
     volume = {147},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1980_147_a4/}
}