@article{GDZPPN002068753, title = {Homotopy and isotopy in dimension three.}, journal = {Commentarii mathematici Helvetici}, volume = {68}, year = {1993}, pages = {341-364}, zbl = {0805.57008}, url = {http://dml.mathdoc.fr/item/GDZPPN002068753} }
Hass, Joel; Scott, Peter. Homotopy and isotopy in dimension three.. Commentarii mathematici Helvetici, Tome 68 (1993) pp. 341-364. http://gdmltest.u-ga.fr/item/GDZPPN002068753/