1. Cyclides in pure blending I;Allen;Comput. Aided Geom. Des.,1997
2. Segre Symbols;Belmans,2016
3. Circles on surfaces in the Euclidean 3-space;Blum,1980
4. Circular Arc Structures;Bo,2011
5. Quadratic Forms and Their Classification by Means of Invariant-Factors, by T.J.I'A. Bromwich, vol. 3;Bromwich,1906