**References**

Bankoff, L. ``Are the Twin Circles of Archimedes Really Twins?'' *Math. Mag.* **47**, 214-218, 1974.

Gardner, M. ``Mathematical Games: The Diverse Pleasures of Circles that Are Tangent to One Another.'' *Sci. Amer.* **240**,
18-28, Jan. 1979.

© 1996-9

1999-05-26