@article{JGG_2011_15_1_JGG_2011_15_1_a1,
     author = {S. Gorjanc and M. Hoffmann },
     title = {The {Gergonne} {Conic}},
     journal = {Journal for geometry and graphics},
     pages = {19--28},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {2011},
     url = {http://geodesic.mathdoc.fr/item/JGG_2011_15_1_JGG_2011_15_1_a1/}
}