Yanbing Wang Lixin Wu Wenzhong Shi Xiaojuan Li 3D Integral Modeling for City Surface & Subsurface. 95-105 2006 3D-GIS http://dx.doi.org/10.1007/978-3-540-36998-1_7 conf/3dgis/2006 db/conf/3dgis/3dgis2006.html#WangWSL06