@article{JGG_2013_17_1_JGG_2013_17_1_a4,
     author = {M. Sejfried},
     title = {Amicable {Triangles} and {Perfect} {Circles}},
     journal = {Journal for geometry and graphics},
     pages = {53--67},
     year = {2013},
     volume = {17},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JGG_2013_17_1_JGG_2013_17_1_a4/}
}