@article{1029000677, author = {Jaco, William}, title = {Nonretractable cubes-with-holes.}, journal = {Michigan Math. J.}, volume = {18}, number = {1}, year = {1971}, pages = { 193-201}, language = {en}, url = {http://dml.mathdoc.fr/item/1029000677} }
Jaco, William. Nonretractable cubes-with-holes.. Michigan Math. J., Tome 18 (1971) no. 1, pp. 193-201. http://gdmltest.u-ga.fr/item/1029000677/