@article{SM_1995_186_4_a6,
     author = {E. V. Nikolaev},
     title = {Bifurcations of limit cycles of differential equations admitting an~involutive symmetry},
     journal = {Sbornik. Mathematics},
     pages = {611--627},
     publisher = {mathdoc},
     volume = {186},
     number = {4},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_186_4_a6/}
}