@article{DE_1967_3_9_a8,
     author = {I. P. Karklin' and L. \'E. Reizi\c{n}\v{s}},
     title = {The topological equivalence of systems of total differential equations in neighborhoods of closed trajectories},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1495--1507},
     publisher = {mathdoc},
     volume = {3},
     number = {9},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_9_a8/}
}