Bollen, J., H. Mao, and A. Pepe. “Modeling Public Mood and Emotion: Twitter Sentiment and Socio-Economic Phenomena”. Proceedings of the International AAAI Conference on Web and Social Media, vol. 5, no. 1, Aug. 2021, pp. 450-3, doi:10.1609/icwsm.v5i1.14171.