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@article{CMH_1992__67_3_140273, author = {J. Scott Carter}, title = {Extending immersed circles in the sphere to immersed disks in the ball.}, journal = {Commentarii mathematici Helvetici}, pages = {337--348}, publisher = {mathdoc}, volume = {67}, number = {3}, year = {1992}, zbl = {0766.57018}, url = {http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140273/} }
J. Scott Carter. Extending immersed circles in the sphere to immersed disks in the ball.. Commentarii mathematici Helvetici, Tome 67 (1992) no. 3, pp. 337-348. http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140273/