DSphere: A Source-Centric Approach to Crawling, Indexing and Searching the World Wide Web. - Bhuvan Bamba; Ling Liu 001; James Caverlee; Vaibhav Padliya; Mudhakar Srivatsa; Tushar Bansal; Mahesh Palekar; Joseph Patrao; Suiyang Li; Aameek Singh (ICDE, 2007)