1. Zhu, X., Ghahramni, Z., Lafferty, J.: Semi-supervised learning using Gaussian fields and harmonic functions. In: ICML, pp. 912–919 (2003)
2. Zhou, D., Bousquet, O., Lal, T., Weston, J., Schölkopf, B.: Learning with local and global consistency. In: NIPS, pp. 321–328 (2004)
3. Sindhwani, V., Niyogi, P., Belkin, M., Keerthi, S.: Linear manifold regularization for large scale semi-supervised learning. In: ICML (2005)
4. Belkin, M., Niyogi, P., Sindhwani, V.: Manifold regularization: a geometric framework for learning from labeled and unlabeled examples. JMLR 7, 2399–2434 (2006)
5. Cai, D., He, X., Han, J.: Semi-supervised discriminant analysis. In: ICCV (2007)