Elzbieta Pekalska Robert P. W. Duin Prototype Selection for Finding Efficient Representations of Dissimilarity Data. 37-40 2002 ICPR (3) http://doi.ieeecomputersociety.org/10.1109/ICPR.2002.1047789 db/conf/icpr/icpr2002-3.html#PekalskaD02