A proof is given that, with the only exception of (3,2), all toroidal knots in R3 obtained in the standard way by stereographic projection of knots in S3 have tritangent planes.
@article{urn:eudml:doc:44300, title = {Tritangent planes to toroidal knots.}, journal = {Revista Matem\'atica de la Universidad Complutense de Madrid}, volume = {4}, year = {1991}, pages = {219-223}, zbl = {0744.53002}, mrnumber = {MR1145696}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:44300} }
Montesinos Amilibia, A. Tritangent planes to toroidal knots.. Revista Matemática de la Universidad Complutense de Madrid, Tome 4 (1991) pp. 219-223. http://gdmltest.u-ga.fr/item/urn:eudml:doc:44300/