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2. Charlie Gunn and Delle Maxwell (directors), Not Knot, A K Peters, 1991.
3. Jeff Weeks, “Real-time rendering in curved spaces”, IEEE Computer Graphics & Applications 22 No. 6 (Nov–Dec 2002) 90–99.
4. Thomas Möller and Eric Haines, Real-Time Rendering, 2nd edition, A K Peters, 2002.
5. Edwin F. Taylor and John Archibald Wheeler, Spacetime Physics, W.H. Freeman and Co., 1963.