1. Almazro, D., Shahatah, G., Albdulkarim, L., Kherees, M., Martinez, R., Nzoukou, W.: A Survey Paper on Recommender Systems. Arxiv preprint, arXiv:1006.5278 (2010)
2. Bakliwal, A., Patil., A., Arora, P., Varma, V.: Towards Enhanced Opinion Classification using NLP Techniques. In: Proceedings of the Workshop on Sentiment Analysis where AI meets Psychology (SAAIP), IJCNLP, Chiang Mai, Thailand, November 13, pp. 101–107 (2011)
3. Benamara, F., Cesarano, C., Picariello, A., Reforgiato, D., Subrahmanian, V.S.: Sentiment analysis: Adjectives and adverbs are better than adjectives alone. In: Proceedings of the International Conference on Weblogs and Social Media (ICWSM) (2007)
4. Bermingham, A., Smeaton, A.: Classifying Sentiment in Microblogs: Is Brevity an Advantage? In: CIKM 2010, Toronto, Ontario, Canada, October 26-29 (2010)
5. Bodapati, A.V.: Recommendation Systems with Purchase Data. Journal of Marketing Research 45(1), 77–93 (2008)