Bozarth, L., and C. Budak. “Market Forces: Quantifying the Role of Top Credible Ad Servers in the Fake News Ecosystem”. Proceedings of the International AAAI Conference on Web and Social Media, vol. 15, no. 1, May 2021, pp. 83-94, https://ojs.aaai.org/index.php/ICWSM/article/view/18043.