Claudio Cifarelli Mario Rosario Guarracino Onur Seref Salvatore Cuciniello Panos M. Pardalos Incremental Classification with Generalized Eigenvalues. 205-219 2007 24 J. Classification 2 http://dx.doi.org/10.1007/s00357-007-0012-z db/journals/classification/classification24.html#CifarelliGSCP07