Affiliation: | (1) Department of Mathematics, Tamaki Campus, The University of Auckland, Private Bag, 92019 Auckland, New Zealand;(2) INRIA Rennes, Campus de Beaulieu, 35042 Rennes Cedex, France;(3) Konputazio Zientziak eta A.A. saila, Informatika Fakultatea, EHU, Donostia, Spain |