@article{1102649990, author = {Frohman, Charles}, title = {An unknotting lemma for systems of arcs in $F\times I$.}, journal = {Pacific J. Math.}, volume = {140}, number = {2}, year = {1989}, pages = { 59-66}, language = {en}, url = {http://dml.mathdoc.fr/item/1102649990} }
Frohman, Charles. An unknotting lemma for systems of arcs in $F\times I$.. Pacific J. Math., Tome 140 (1989) no. 2, pp. 59-66. http://gdmltest.u-ga.fr/item/1102649990/