1. F. Brackx, R. Delanghe and F. Sommen, Clifford Analysis, Pitman, Boston, London, Melbourne, 1982.
2. P. Cerejeiras, Decomposition of analytic hyperbolically harmonic functions. Proceedings of Clifford Algebras and their Applications Aachen, Kluwer, Dordrecht (1998), 45–51.
3. J. Cnops, Hurwitz pairs and applications of Möbius transformation, Ph.D. thesis, Univ. Gent, 1994.
4. J. Gilbert and M. Murray, Clifford algebras and Dirac operators in harmonic analysis, Cambridge studies in advanced mathematics 26, Cambridge, New York (1991).
5. S.-L. Eriksson-Bique, Comparison of quaternionic analysis and its modification, To appear in the Proceedings of Delaware, 1–16.