@article{DE_2006_42_6_a3,
     author = {P. F. Samusenko},
     title = {Construction of periodic solutions of a nonlinear singularly perturbed system of differential equations with degeneration},
     journal = {Differencialʹnye uravneni\^a},
     pages = {756--763},
     publisher = {mathdoc},
     volume = {42},
     number = {6},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_6_a3/}
}