Azarakhsh MalekianCombinatorial Problems in Online Advertising.2009University of Maryland, College Park, MD, USAhttps://hdl.handle.net/1903/9969https://www.base-search.net/Record/27c08d0c7c8b32979ae431e7eaa110526f9e54e0e2d8bbf5772ac99730f94783base-search.net (ftunivmaryland:oai:drum.lib.umd.edu:1903/9969)