1. Ekman, P.: An argument for basic emotions. Cogn. Emot. 6(3), 169–200 (1992)
2. Ekman, P.: Emotion in the Human Face. Oxford University Press (2005)
3. Ekman, P., Friesen, W.V.: Unmasking the Face: A Guide to Recognizing Emotions From Facial Expressions. Marlor Books (2003)
4. Bandhakavi, A., Wiratunga, N., Deepak, P., Massie, S.: Generating a word-emotion lexicon from #emotional tweets. In: Proceedings of the Third Joint Conference on Lexical and Computational Semantics (*SEM2014), Dublin, Ireland, pp. 12–21 (2014, August)
5. Xu, G., Meng, X., Wang, H.: Build Chinese emotion lexicons using a graph-based algorithm and multiple resources. In: Proceedings of the 23rd International Conference on Computational Linguistics (Coling 2010), Beijing, China, pp. 1209–1217 (2010, August)