1. Adem, J.: ‘Construction of some normed maps’, Bol. Soc. Mat. Mexicana (2)20 (1975), 59–75.
2. Adem, J.: ‘On maximal sets of anticommuting matrices’, ibid. (2)23 (1978), 61–67.
3. Adem, J.: ‘On the Hurwitz problem over an arbitrary field I-II’, ibid (2)25 (1980), 29–51 and (2) 26 (1981), 29-41.
4. Ahlfors, L.V.: Lectures on quasiconformal mappings, Van Nostrand, Princeton 1966.
5. BartíK, V., A. Vaz Ferreira, M. Markl, and V. Souček: ‘Index and Cauchy integral formula in complex-quater-nionic analysis’, Simon Stevin Quart. J. Pure Appl. Math., to appear.