1. Agarwal, A., Xie, B., Vovsha, I., Rambow, O., & Passonneau, R. (2011). Sentiment analysis of twitter data. In Proceedings of language in social media (pp. 30–38), Portland, OR.
2. Aisopos, F., Papadakis, G., Tserpes, K., & Varvarigou, T. (2012). Textual and contextual patterns for sentiment analysis over microblogs. In Proceedings of the 21st WWW companion (pp. 453–454), New York, NY.
3. Affect in text and speech;Alm,2008
4. Alm, C.O., Roth, D., & Sproat, R. (2005). Emotions from text: Machine learning for text-based emotion prediction. In Proceedings of the joint conference on HLT–EMNLP, Vancouver, Canada.
5. Aman, S., & Szpakowicz, S. (2007). Identifying expressions of emotion in text. In Text, speech and dialogue, Vol. 4629 of lecture notes in computer science (pp. 196–205).