P. Ekman, "An argument for basic emotions," Cognition and Emotion, Vol.6, Issue 3-4, pp.169-200, 1992.
M. Suzuki and H. Kimura, "Support for Learning Concise Expressions with Affective Features Extracted from Context of Usage," The 7th Edition of International Conference ICT for Language Learning (ICT4LL2014), Florence, 2014.
M. Tomasello, "Constructing a language: A usage-based theory of language acquisition," Cambridge, MA: Harvard University Press, 2003.