KAMERER, D. Estimating online audiences: Understanding the limitations of competitive intelligence services. First Monday, [S. l.], v. 18, n. 5, 2013. DOI: 10.5210/fm.v18i5.3986. Disponível em: https://journals.uic.edu/ojs/index.php/fm/article/view/3986. Acesso em: 25 jan. 2022.