@article{GDZPPN002438550,
title = {Knot and link projections in 3-manifolds.},
journal = {Mathematische Zeitschrift},
volume = {207},
year = {1991},
pages = {345-350},
zbl = {0695.57006},
url = {http://dml.mathdoc.fr/item/GDZPPN002438550}
}
Skora, Richard K. Knot and link projections in 3-manifolds.. Mathematische Zeitschrift, Tome 207 (1991) pp. 345-350. http://gdmltest.u-ga.fr/item/GDZPPN002438550/