@article{JGG_2006_10_2_JGG_2006_10_2_a0,
     author = {J. Beban-Brkic and R. Kolar-Super and Z. Kolar-Begovic and V. Volenec },
     title = {On {Feuerbach's} {Theorem} and a {Pencil} of {Circles} in the {Isotropic} {Plane}},
     journal = {Journal for geometry and graphics},
     pages = {125--132},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {2006},
     url = {http://geodesic.mathdoc.fr/item/JGG_2006_10_2_JGG_2006_10_2_a0/}
}