Transition between concentric or tangent circles with a single segment of G<sup>2</sup> PH quintic curve.

Zulfiqar Habib Manabu Sakai Transition between concentric or tangent circles with a single segment of G<sup>2</sup> PH quintic curve. 247-257 2008 25 Computer Aided Geometric Design 4-5 http://dx.doi.org/10.1016/j.cagd.2007.10.006 db/journals/cagd/cagd25.html#HabibS08