Noga Alon, Baruch Awerbuch, Yossi Azar, Niv Buchbinder, Joseph Naor. The online set cover problem. In Proceedings of the 35th Annual ACM Symposium on Theory of Computing, June 9-11, 2003, San Diego, CA, USA. pages 100-105, ACM, 2003. [doi]
Abstract is missing.