@article{GDZPPN002085860,
title = {The tightness of tubes.},
journal = {Forum mathematicum},
volume = {9},
year = {1997},
pages = {707-720},
zbl = {0885.53065},
url = {http://dml.mathdoc.fr/item/GDZPPN002085860}
}
Kühnel, Wolfgang; Breuer, Peter. The tightness of tubes.. Forum mathematicum, Tome 9 (1997) pp. 707-720. http://gdmltest.u-ga.fr/item/GDZPPN002085860/