Coordinates

                                                                                                Dr. S.T.Swift,

                                                                                                Department of Mathematical Sciences,

                                                                                                University of the West of England,

                                                                                                Coldharbour Lane,

                                                                                                Bristol  BS16 1QY,

                                                                                                England.

                                                                                                tel.        +44 (0)117 328 3352

                                                                                                fax.        +44 (0)117 328 2734

                                                                                                email      tim.swift@uwe.ac.uk