@article{DE_1969_5_6_a17,
     author = {I. Ya. Viner},
     title = {Differential equations with involutions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1131--1137},
     publisher = {mathdoc},
     volume = {5},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_6_a17/}
}