@article{JGG_2019_23_1_JGG_2019_23_1_a5,
     author = {M. Ternullo },
     title = {Common {Tangents} to {Ellipse} and {Circles,} the {13-Point} {Circle} and {Other} {Theorems}},
     journal = {Journal for geometry and graphics},
     pages = {45--63},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {2019},
     url = {http://geodesic.mathdoc.fr/item/JGG_2019_23_1_JGG_2019_23_1_a5/}
}