Chuanjiang Luo Jian Sun Yusu Wang Integral estimation from point cloud in d-dimensional space: a geometric view. 116-124 2009 Symposium on Computational Geometry http://doi.acm.org/10.1145/1542362.1542389 conf/compgeom/2009 db/conf/compgeom/compgeom2009.html#LuoSW09