Institution: | A1 Department of Mathematics, National Taiwan University, Taipei 106, Taiwan E-mail: cheng@math.ntu.edu.tw A2 Centre for Mathematics and its Applications, Australian National University, Canberra ACT 0200, Australia E-mail: peter.hall@anu.edu.au A3 Department of Statistics, University of Adelaide, Adelaide SA 5005, Australia E-mail: bturlach@stats.adelaide.edu.au |