@article{01817771, title = {Ivory's theorem in the Minkowski plane.}, journal = {Mathematica Pannonica}, volume = {13}, year = {2002}, pages = {11-22}, zbl = {1006.51018}, language = {en}, url = {http://dml.mathdoc.fr/item/01817771} }
Stachel, Hellmuth. Ivory's theorem in the Minkowski plane.. Mathematica Pannonica, Tome 13 (2002) pp. 11-22. http://gdmltest.u-ga.fr/item/01817771/