1. Gross, H., and K�nzi, U. M. (1980). On a class of orthomodular quadratic spaces,L'Enseignement Math�matique,31, 187?212.
2. Keller, H., and Ochsenius, H. (1994). Algebras of bounded operators on non-classical orthomodular spaces,International Journal of Theoretical Physics,33(1), 1?11.
3. Keller, H., and Ochsenius, H. (1995a). Bounded operators on non-Archimedian orthomodular spaces,Mathematica Slovaka, to appear.
4. Keller, H., and Ochsenius, H. (1995b). A spectral theorem for matrices over fields of power series,Annales Scientifiques de l'Universit� Blaise Pascal, to appear.
5. Ribenboim, P. (1964).Th�orie des Valuations, Les Presses de l'Universit� de Montreal, Montreal.