@article{GDZPPN002321033, title = {Ribbon Concordance of Knots in the 3-Sphere.}, journal = {Mathematische Annalen}, volume = {255}, year = {1981}, pages = {157-170}, zbl = {0451.57001}, url = {http://dml.mathdoc.fr/item/GDZPPN002321033} }
Gordon, C.McA. Ribbon Concordance of Knots in the 3-Sphere.. Mathematische Annalen, Tome 255 (1981) pp. 157-170. http://gdmltest.u-ga.fr/item/GDZPPN002321033/