Roberto Tronci Giorgio Giacinto Fabio Roli Combination of Experts by Classifiers in Similarity Score Spaces. 821-830 2008 SSPR/SPR http://dx.doi.org/10.1007/978-3-540-89689-0_86 conf/sspr/2008 db/conf/sspr/sspr2008.html#TronciGR08