Federated search of text search engines in uncooperative environments
Luo Si · ACM SIGIR Forum · 2007
Conventional search engines like Google provide access to Web information that can be acquired easily by crawling hyperlinks. However, a large amount of information cannot be copied arbitrarily by conventional search engines. This type of hidden information, which is very valuable, can only be accessed via an alternative search model other than the centralized retrieval model used by conventional search engines.