@article{DE_1990_26_4_a25,
     author = {I. G. Rozet and V. V. Filinych},
     title = {Bifurcations and perturbations of an integral ``torus-sphere'' manifold},
     journal = {Differencialʹnye uravneni\^a},
     pages = {721--723},
     publisher = {mathdoc},
     volume = {26},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_4_a25/}
}