Mark de Berg Herman J. Haverkort Shripad Thite Laura Toma I/O-Efficient Map Overlay and Point Location in Low-Density Subdivisions. 500-511 2007 conf/isaac/2007 ISAAC http://dx.doi.org/10.1007/978-3-540-77120-3_44 db/conf/isaac/isaac2007.html#BergHTT07