@article{GDZPPN00209066X, title = {Cocordance and Isotopy of Smooth Embeddings in Low Codimensions.}, journal = {Inventiones mathematicae}, volume = {20}, year = {1973}, pages = {223-232}, zbl = {0254.57017}, url = {http://dml.mathdoc.fr/item/GDZPPN00209066X} }
Hatcher, Allen E. Cocordance and Isotopy of Smooth Embeddings in Low Codimensions.. Inventiones mathematicae, Tome 20 (1973) pp. 223-232. http://gdmltest.u-ga.fr/item/GDZPPN00209066X/