Lasseter, John (July 1987). "Principles of Traditional Animation applied to 3D Computer Animation". ACM Computer Graphics, Vol. 21, Number 4. pp. 35–44. http://www.evl.uic.edu/ralph/508S99/straight.html
Lasseter, John (July 1987). "Principles of Traditional Animation applied to 3D Computer Animation". ACM Computer Graphics, Vol. 21, Number 4. pp. 35–44. http://www.evl.uic.edu/ralph/508S99/straight.html