Mariano Pérez Xaro Benavent Ricardo Olanda Efficient Coding of Quadtree Nodes. 13-16 2006 conf/iccS/2006-3 International Conference on Computational Science (3) http://dx.doi.org/10.1007/11758532_3 db/conf/iccS/iccS2006-3.html#PerezBO06