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@article{MZ_1991__206_1_174231, author = {Richard K. Skora}, title = {Knot and link projections in 3-manifolds.}, journal = {Mathematische Zeitschrift}, pages = {345--350}, publisher = {mathdoc}, volume = {206}, number = {1}, year = {1991}, zbl = {0695.57006}, url = {http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174231/} }
Richard K. Skora. Knot and link projections in 3-manifolds.. Mathematische Zeitschrift, Tome 206 (1991) no. 1, pp. 345-350. http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174231/