Garimella, K., T. Smith, R. Weiss, and R. West. “Political Polarization in Online News Consumption”. Proceedings of the International AAAI Conference on Web and Social Media, vol. 15, no. 1, May 2021, pp. 152-6, https://ojs.aaai.org/index.php/ICWSM/article/view/18049.