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@article{FORUM_1997__9_2_141819, author = {Wolfgang K\"uhnel and Peter Breuer}, title = {The tightness of tubes.}, journal = {Forum mathematicum}, pages = {707--720}, publisher = {mathdoc}, volume = {9}, number = {2}, year = {1997}, zbl = {0885.53065}, url = {http://geodesic.mathdoc.fr/item/FORUM_1997__9_2_141819/} }
Wolfgang Kühnel; Peter Breuer. The tightness of tubes.. Forum mathematicum, Tome 9 (1997) no. 2, pp. 707-720. http://geodesic.mathdoc.fr/item/FORUM_1997__9_2_141819/