1. Peter Rastall Quaternions in Relativity Reviews of Modern Physics July 1964 p 820-832
2. W. Pauli Theory of Relativity 1958
3. L. Silberstein Quaternionic Form of Relativity Phil Mag S. 6 vol 23 No. 137 (May 1912) 790-809
4. Harley Flanders Differential Forms with Applications to the Physical Sciences Dover 1989
5. Charles W. Misner, Kip S. Thorne and John Archibald Wheeler, Gravitation, W. H. Freeman 1973
6. Anthony Sudbery Quaternionic Analysis Proc. Camb. Phil. Soc. v85 pages 199-225 (1979)
7. Andre Gsponer Lanczos’s equation to replace Dirac’s equation, The physical heritage of Sir W.R. Hamilton
8. Richard Feynman &Albert Hibbs Quantum Mechanics and Path Integrals  McGraw-Hill, New York, 1965 (Problem 3-4 page 43-36)

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