A statistical approach to recognizing source classes for unassociated sources in the first Fermi-lat catalog - Ackermann, M.; Ajello, M.; Allafort, A.; Antolini, E.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bellazzini, R.; Berenji, B.; Blandford, R.; Bloom, E.; et al. (Institute of Physics Publishing, 2012)