Konstantinos Blekas K. Christodoulidou Isaac E. Lagaris Newtonian Spectral Clustering. 145-154 2009 ICANN (2) http://dx.doi.org/10.1007/978-3-642-04277-5_15 conf/icann/2009-2 db/conf/icann/icann2009-2.html#BlekasCL09