Andrea Cerri Silvia Biasotti Daniela Giorgi k-dimensional Size Functions for Shape Description and Comparison. 795-800 2007 conf/iciap/2007 ICIAP http://doi.ieeecomputersociety.org/10.1109/ICIAP.2007.83 db/conf/iciap/iciap2007.html#CerriBG07