1. Rational Generalized Offsets of Rational Surfaces
2. G. H. Georgiev, Generalized offset surfaces of cylindrical surfaces, AIP Conference Proceedings, vol. 1789 (2016), 131–136.
3. CURVATURE DEPENDENT OFFSETS TO ELLIPTIC CONES
4. G. H. Georgiev and M. D. Pavlov,, Focal Surfaces of Hyperbolic Cylinders, AIP Conference Proceedings, Vol. 1910(2017), 05000510500058
5. A. Gray, E. Abbena, and S. Salamon, Modern Differential Geometry of Curves and Surfaces with Mathematica, 13rd edition, Studies in Advanced Mathematics, Chapman & Hall/CRC, Boca Raton, 2006.