1. Blei DM, Griffiths TL, Jordan MI, Tenenbaum JB (2003a) Hierarchical topic models and the nested Chinese restaurant process. In: NIPS, vol 16
2. Blei DM, Ng AY, Jordan MI (2003b) Latent dirichlet allocation. J Mach Learn Res 3:993–1022
3. Blei DM, McAuliffe JD (2007) Supervised topic models. NIPS 7:121–128
4. Blum A, Mitchell T (1998) Combining labeled and unlabeled data with co-training. In: Proceedings of COLT, pp 92–100
5. Brown PF, Desouza PV, Mercer RL, Della Pietra VJ, Lai JC (1992) Class-based n-gram models of natural language. Comput Linguist 18(4):467–479