1. Arasu, A., Cho, J., Garcia-Molina, H., Paepcke, A., Raghavan, S.: Searching the web. ACM Transactions on Internet Technology 1(1), 2–43 (2001)
2. Baeza-Yates, R., Castillo, C., Marín, M., Rodríguez, A.: Crawling a country: Better strategies than breadth-first for web page ordering. In: WWW 2005, Industrial Track. ACM Press, New York (2005)
3. Baeza-Yates, R., Ribeiro-Neto, B.: Modern Information Retrieval. Addison Wesley/ACM Press (1999)
4. Cohen, E., Kaplan, H.: Refreshment policies for web content caches. Comput. Networks 38(6), 795–808 (2002)
5. Do, L., Ram, O., Drew, P.: The need for distributed asynchronous transactions. ACM SIGMOD Record 28(2), 534–535 (1999)