Alan Barr(31 januari 1881)(på engelska).Superquadrics and Angle-Preserving Transformations. "1". IEEE Computer Graphics and Applications. sid.11-23. doi:10.1109/MCG.1981.1673799. ISSN1558-1756.
Alan Barr(31 januari 1881)(på engelska).Superquadrics and Angle-Preserving Transformations. "1". IEEE Computer Graphics and Applications. sid.11-23. doi:10.1109/MCG.1981.1673799. ISSN1558-1756.