R. Karthik Aditya Ramana Rachakonda Srinath Srinivasa Query Heartbeat: A Strange Property of Keyword Queries on the Web. 21-29 2008 COMAD http://www.cse.iitb.ac.in/~comad/2008/PDFs/50-keywords.pdf conf/comad/2008 db/conf/comad/comad2008.html#KarthikRS08