@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/