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@article{MAN_1983__263_163729, author = {L. Vanhecke and T.J. Willmore}, title = {Interaction of {Tubes} and {Spheres.}}, journal = {Mathematische Annalen}, pages = {31--42}, publisher = {mathdoc}, volume = {263}, year = {1983}, zbl = {0491.53034}, url = {http://geodesic.mathdoc.fr/item/MAN_1983__263_163729/} }
L. Vanhecke; T.J. Willmore. Interaction of Tubes and Spheres.. Mathematische Annalen, Tome 263 (1983), pp. 31-42. http://geodesic.mathdoc.fr/item/MAN_1983__263_163729/