@article {Guarracino2007OMS, author = "Guarracino, M.R. and Cifarelli, C. and Seref, O. and Pardalos, P.", title = "A Classification Method Based on Generalized Eigenvalue Problems,", journal = "Optimization Methods and Software", publisher= "Springer", volume = "22", number = "1", pages = "73--81", year = "2007" }