Chandra Guntuku, S., A. Buffone, K. Jaidka, J. C. Eichstaedt, and L. H. Ungar. “Understanding and Measuring Psychological Stress Using Social Media”. Proceedings of the International AAAI Conference on Web and Social Media, Vol. 13, no. 01, July 2019, pp. 214-25, https://www.aaai.org/ojs/index.php/ICWSM/article/view/3223.