@article{GDZPPN002311593,
title = {Knotted Ball Pairs whose Product with an Interval is Unknotted.},
journal = {Mathematische Annalen},
volume = {217},
year = {1975},
pages = {47-52},
zbl = {0293.57010},
url = {http://dml.mathdoc.fr/item/GDZPPN002311593}
}
Gordon, C.McA.; Sumners, D.W. Knotted Ball Pairs whose Product with an Interval is Unknotted.. Mathematische Annalen, Tome 217 (1975) pp. 47-52. http://gdmltest.u-ga.fr/item/GDZPPN002311593/