1. Arnold V. I. (1975) “Mathematical Methods of Classical Mechanics”, Springer-Verlag
2. Barnhill R. E. and Riesenfeld R. F. (1974) “Computer-Aided Geometric Design”, Academic Press, 1974
3. Barr A. H. (1984) “Global and Local Deformations of Solid Primitives”, SIGGRAPH Tutorial Notes
4. Barr A. H. (1981) “Superquadrics and Angle-Preserving Transformations”, IEEE CG & A, Vol 1, No 1, pp 11–23
5. Barr A. H. (1984) “Introduction to the Einstein Summation Notation”, SIGGRAPH Tutorial Notes