@article{1200692534, author = {Yanagawa, Takaaki}, title = {On ribbon 2-knots. The 3-manifold bounded by the 2-knots}, journal = {Osaka J. Math.}, volume = {6}, number = {1}, year = {1969}, pages = { 447-464}, language = {en}, url = {http://dml.mathdoc.fr/item/1200692534} }
Yanagawa, Takaaki. On ribbon 2-knots. The 3-manifold bounded by the 2-knots. Osaka J. Math., Tome 6 (1969) no. 1, pp. 447-464. http://gdmltest.u-ga.fr/item/1200692534/