Geodesic
On the problem of isochronism for systems with discontinuous right-hand sides
Differencialʹnye uravneniâ, Tome 10 (1974) no. 4, pp. 647-658 
I. I. Pleshkan. On the problem of isochronism for systems with discontinuous right-hand sides. Differencialʹnye uravneniâ, Tome 10 (1974) no. 4, pp. 647-658. http://geodesic.mathdoc.fr/item/DE_1974_10_4_a9/
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     author = {I. I. Pleshkan},
     title = {On the problem of isochronism for systems with discontinuous right-hand sides},
     journal = {Differencialʹnye uravneni\^a},
     pages = {647--658},
     year = {1974},
     volume = {10},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_4_a9/}
}
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