This paper has now appeared in Algebra Colloquium 7(2000), p. 335-360
and so the preprint has been removed. This is a revision of the preprint number 186 posted in june 1999.
There some statements about field extensions in section 2.6 were incorrect.
The corrections do not change the results.
For a discrete co-compact subgroup of the unitary group SU(3,L) automorphic functions are constructed.
Here L is a quadratic extension of some p-adic local field K.
These functions are well-defined on some open analytical subspace of the projective plane.
King Fai Lai and Harm Voskuil <email@example.com ; firstname.lastname@example.org>