Francesco Bellocchio Stefano Ferrari Vincenzo Piuri N. Alberto Borghese Online Training of Hierarchical RBF. 60-68 2007 conf/kes/2007-1 KES (1) http://dx.doi.org/10.1007/978-3-540-74819-9_8 db/conf/kes/kes2007-1.html#BellocchioFPB07