1. Arena, P., Fortuna, L., Museato, G., and Xibilia, M. (1997). Multilayer perceptrons to approximate quaternion valued functions. Neural Networks, 10(2):335–342.
2. Banarer, V., Perwass, C., and Sommer, G. (2003a). Design of a multilayered feed-forward neural network using hypersphere neurons. In Proc. Int. Conf. Computer Analysis of Images and Patterns, CAIP 2003, Groningen, August 2003. accepted.
3. Banarer, V., Perwass, C., and Sommer, G. (2003b). The hypersphere neuron. In 11th European Symposium on Artificial Neural Networks, ESANN 2003, Bruges, pages 469–474. d-side publications, Evere, Belgium.
4. Brackx, F., Delanghe, R., and Sommen, F. (1982). Clifford Analysis. Pitman Advanced Publ. Program, Boston.
5. Buchholz, S. and Sommer, G. (2000a). A hyperbolic multilayer perceptron. In Amari, S., Giles, C., Gori, M., and Piuri, V., editors, International Joint Conference on Neural Networks, IJCNN 2000, Como, Italy, volume 2, pages 129–133. IEEE Computer Society Press.