@article{00822755,
title = {On opposite angle points in isotropic triangle geometrics. (Zu den Winkelgegenpunkten der isotropen Dreiecksgeometrie.)},
journal = {Mathematica Pannonica},
volume = {6},
year = {1995},
pages = {155-161},
zbl = {0842.51016},
language = {en},
url = {http://dml.mathdoc.fr/item/00822755}
}
Tölke, Jürgen. On opposite angle points in isotropic triangle geometrics. (Zu den Winkelgegenpunkten der isotropen Dreiecksgeometrie.). Mathematica Pannonica, Tome 6 (1995) pp. 155-161. http://gdmltest.u-ga.fr/item/00822755/