1. Quaternion  
   Eric Weisstein, World of Mathematics, Wolfram Res., Inc., Champaign, IL   
2. On a new Species of Imaginary Quantities connected with a theory of Quaternions  
   D.R. Wilkins, School of Mathematics,Trinity College, Dublin, Ireland   
3. Using Quaternions to Represent Rotation  
   Laura Downs, Computer Science Dept., Univ. of California at Berkeley, CA  
4. Do quaternions really perform rotations ?  
   Laura Downs, Computer Science Dept., Univ. of California at Berkeley, CA  
5. Quaternion inverse  
   Harold V. McIntosh, Aplicación de Microcomputadoras, Univ. Autónoma de Puebla, México  
6. An Explanation of Quaternion Rotation in Euclidean Space  
   Jason Shankel, Sr. Software Engineer, Maxis, Inc.
7. Quaternion Julia Sets  
   Tim Stilson, Center for Computer Research in Music, Stanford University, CA  
8. Quaternion and Hypercomplex Algebra  
   Noel Giffin, TRIUMF, Canada's Lab. for Particle and Nuclear Physics, Vancouver, B.C.
9. Quaternion Julia Fractals  
   Paul Bourke, Astrophysics and Supercomputing, Swinburne Univ. of Tech., Victoria, Australia
10. Quaternion Reference Site  
    Dave Barber, Computer Science, Georgia State University, Atlanta, GA  
11. Quaternion Rotation  
    Dave Barber, Computer Science, Georgia State University, Atlanta, GA  
12. Quaternions  
    Rick Jacoby, Spatial Perception Lab, NASA Ames Research Center, Moffett Field, CA  
13. Quaternion Julia Set VRML Server  
    John C. Hart, Computer Science Dept., University of Illinois, Urbana, IL  
14. Quaternion Julia Sets in Virtual Reality  
    Daniel Sandin, Electronic Visualization Laboratory, University of Illinois at Chicago, IL  
15. Real Cayley, quaternion, and octonian algebras  
    W. D. Joyner, Math. Dept., U. S. Naval Academy, Annapolis, MD  
16. A Brief History of Quaternions  
    Douglas Sweetser, degrees from  Brandeis University and Massachusetts Institute of Tech.
17. Quaternion Demonstrator applet  
    John C. Hart, E. E. and Computer Science, Washington State Univ., Pullman, WA  
18. Quaternions, Octonions, and Physics  
    Frank D. (Tony) Smith, Jr., P. O. Box 370, Cartersville GA  
19. Quaternion videos  
    Godwin Vickers,  Hypercomplex.org  
20. Quaternion Powers  
    Sobeit Void, Gamedev.net  
21. Quaternion Algebra and Calculus PDF  
    David Eberly, Magic Software, Inc., Chapel Hill, NC

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(c) John H. Mathews 2003