@article{GDZPPN002237237, title = {A finite graphic calculus for 3-manifolds.}, journal = {Manuscripta mathematica}, volume = {86}, year = {1995}, pages = {291-310}, zbl = {0856.57009}, url = {http://dml.mathdoc.fr/item/GDZPPN002237237} }
Benedetti, Riccardo; Petronio, Carlo. A finite graphic calculus for 3-manifolds.. Manuscripta mathematica, Tome 86 (1995) pp. 291-310. http://gdmltest.u-ga.fr/item/GDZPPN002237237/