Chung, F.R.K. Spectral Graph Theory; American Mathematical Society: Providence, RI, USA, 1996; ISBN 978-0-8218-0315-8. 9. Herrera, M.; Canu, S.; Karatzoglou, A.; Pérez-García, R.; Izquierdo, J. An approach to water supply clusters by semi-supervised learning. In Proceedings of...