1. A short note on cyclide intersections;Brakhage,1993
2. Quadratic Forms and their Classification by Means of Invariant-Factors;Bromwich,1906
3. On the cyclide;Cayley;Quart. J. Pure Appl. Math.,1873
4. On cyclides and sphero-quartics;Casey;Phil. Trans. Roy. Soc.,1871
5. Variable radius blending using Dupin cyclides;Chandru,1990