1. Convex Polyhedra;Aleksandrov,1950
2. Topological invariants of plane curves and caustics;Arnold,1994
3. Geometry of spherical curves and the quarternionic algebra;Arnold;Uspekhi. Mat. Nauk,1995
4. Kreis und Kugel;Blaschke,1967
5. On the number of circles of curvature perfectly enclosing or perfectly enclosed by a closed oval;Bose;Math. Ann.,1932