@article{DE_1974_10_3_a4,
     author = {N. P. Prikhod'ko},
     title = {The cyclic trajectories of systems with switching},
     journal = {Differencialʹnye uravneni\^a},
     pages = {431--435},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_3_a4/}
}