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J. M.  Machado and Borges, M. F., ?COMPLEXIFIED FUETER OPERATORS IN CLASSICAL AND QUANTUM ELECTRODYNAMICS?, Communications in Applied Analysis, vol. 9, no. 2, p. 226, 2005.\par \par J. M.  Machado, ?QUATERNION FUNCTIONS AND FOUR-DIMENSIONAL RIEMANNIAN METRICS?, Communications in Applied Analysis , vol. 9, no. 1, p. 31, 2005.\par \par }