Moshe Babaioff, Jason D. Hartline, Robert D. Kleinberg. Selling ad campaigns: online algorithms with cancellations. In John Chuang, Lance Fortnow, Pearl Pu, editors, Proceedings 10th ACM Conference on Electronic Commerce (EC-2009), Stanford, California, USA, July 6--10, 2009. pages 61-70, ACM, 2009. [doi]
Abstract is missing.