@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/