@article{ND_2011_7_2_a2,
     author = {O. V. Pochinka},
     title = {Necessary and sufficient conditions for topological classification of {Morse--Smale} cascades on 3-manifolds},
     journal = {Russian journal of nonlinear dynamics},
     pages = {227--238},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2011_7_2_a2/}
}