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@article{IM_1985__80_143238, author = {Koichi Yano}, title = {The homotopy class of non-singular {Morse-Smale} vector fields on 3-manifolds.}, journal = {Inventiones mathematicae}, pages = {435--452}, publisher = {mathdoc}, volume = {80}, year = {1985}, zbl = {0622.58018}, url = {http://geodesic.mathdoc.fr/item/IM_1985__80_143238/} }
Koichi Yano. The homotopy class of non-singular Morse-Smale vector fields on 3-manifolds.. Inventiones mathematicae, Tome 80 (1985), pp. 435-452. http://geodesic.mathdoc.fr/item/IM_1985__80_143238/