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TR75-245, June 1975. Quaternion product in only eight real multiplications. Lorenz transformations in relativity can be implemented with quaternions whose elements are complex numbers. Various published and unpublished letters QuaternionRefs.txt Bibliography on Quaternions. How to translate Scheme into C by using continuation-passing style C functions in such a way that tail recursions use bounded amounts of storage, continuation capture is simple, and garbage collection is precise.