@article{JGG_2016_20_1_JGG_2016_20_1_a7,
     author = {M. Ternullo },
     title = {Symbiotic {Conics} and {Quartets} of {Four-Foci} {Orthogonal} {Circles}},
     journal = {Journal for geometry and graphics},
     pages = {85--1},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {2016},
     url = {http://geodesic.mathdoc.fr/item/JGG_2016_20_1_JGG_2016_20_1_a7/}
}