Institution: | 1 School of Mathematics, University of South Australia, Adelaide, South Australia 5005, Australiabruce.brown{at}unisa.edu.au 2 Centre for Mathematics & its Applications, Australian National University, Canberra, A.C.T.0200, Australia. peter.hall{at}anu.edu.au 3 Statistical Laboratory, University of Cambridge, Cambridge CB3 0WB, U.K. g.a.young{at}statslab.cam.ac.uk |