Biswanath Panda Mirek Riedewald Johannes Gehrke Stephen B. Pope High-Speed Function Approximation. 613-618 2007 ICDM http://doi.ieeecomputersociety.org/10.1109/ICDM.2007.107 conf/icdm/2007 db/conf/icdm/icdm2007.html#PandaRGP07