@article{DE_1978_14_5_a1,
     author = {B. M. Arkhipov and A. Ya. Khokhryakov},
     title = {Strictly positive periodic solutions of a nonlinear ordinary differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {798--806},
     publisher = {mathdoc},
     volume = {14},
     number = {5},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_5_a1/}
}