@article{MO_1999_2-3_a2,
     author = {A. Ruinskii},
     title = {Notes on {Apollonian} {Circles}},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {87--94},
     year = {1999},
     number = {2-3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_1999_2-3_a2/}
}