1. Dickson, L.E.: Ann. Math. 20, 155 (1919)
2. Hamilton, W.R.: Elements of Quaternions. Chelsea, New York (1969)
3. Tait, P.G.: An Elementary Treatise on Quaternions. Oxford University Press, Oxford (1875)
4. Finklestein, D., Jauch, J.M., Schiminovich, S., Speiser, D.: J. Math. Phys. 4, 788 (1963)
5. Adler, S.L.: Quaternion Quantum Mechanics and Quantum Fields. Oxford University Press, Oxford (1995)