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5. Gsponer, A., Hurni, J.P.: Quaternion in mathematical physics (1): Alphabetical bibliography, Report ISRI0504 (4 March 2006) 100 pp.; eprint- arXiv:mathph/0510059 ; Quaternion in mathematical physics (2): Analytical bibliography, Report ISRI0505 (4 March 2006) 113 pp.; eprint- arXiv:mathph/0511092 ; Quaternion in mathematical physics (3): Notations and terminology, Report ISRI0506; Quaternion in mathematical physics (4): Formulas and identities, Report ISRI0507