@article{JGG_2006_10_1_JGG_2006_10_1_a5,
     author = {M. Schrott and B. Odehnal },
     title = {Ortho-Circles of {Dupin} {Cyclides}},
     journal = {Journal for geometry and graphics},
     pages = {73--98},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2006},
     url = {http://geodesic.mathdoc.fr/item/JGG_2006_10_1_JGG_2006_10_1_a5/}
}