Avenali, A., A. D'annunzio, and P. Reverberi. “Bundling, Competition and Quality Investment: A Welfare Analysis”. Department of Computer and System Sciences Antonio Ruberti Technical Reports, vol. 3, no. 2, Jan. 2011, https://rosa.uniroma1.it/rosa00/index.php/dis_technical_reports/article/view/8967.