Wenliang Du David Eppstein Michael T. Goodrich George S. Lueker On the Approximability of Geometric and Geographic Generalization and the Min-Max Bin Covering Problem. 242-253 2009 WADS http://dx.doi.org/10.1007/978-3-642-03367-4_22 conf/wads/2009 db/conf/wads/wads2009.html#DuEGL09