Directory
Explore Deep Web Resources & Discovery resources in Dark Web & Underground.
This arXiv paper by Dirk Lewandowski and Philipp Mayr provides a critical review of Bergman's 2001 study on the Deep Web. It introduces the concept of the Academic Invisible Web, defined as databases and collections relevant to academia but not searchable by general-purpose internet search engines, and reviews approaches for indexing it. The authors question Bergman's size estimate and suggest collaboration.
National Transportation Library record for research on discovering and cataloging hidden-web resources.
Explains how metadata and structured access affect discovery of database-backed and deep-web content.
An arXiv paper on discovering skylines over hidden web databases whose search interfaces enforce a top-k output constraint. It examines how search interface controls affect discovery cost and develops algorithms for one-ended range, free range and point predicates, combined for mixed interfaces. Experiments over real-world online and offline databases are reported.
An arXiv paper on digging deeper into hidden web databases limited by the top-k output constraint. It presents the GetNext meta-algorithm, which retrieves the next ranked tuple through a restrictive interface without prior knowledge of the ranking function, and algorithms that generate and execute multiple reformulated queries. Theoretical analysis and experiments over synthetic and real-world databases are reported.
National Academies chapter explaining deep-web content, discovery limits and information retrieval.
Guide to search tools and databases that surface information outside conventional web indexes.
A library support page explaining the invisible web, also called the deep web or hidden web. It states that search engines cover about 16% of the internet and advises against relying on them alone, especially for academic information. It lists content search engines cannot find, such as dynamically changing content, password protected resources and sites requiring registration, and suggests web directories and asking a librarian.
A 2001 book by Chris Sherman and Gary Price examining the nature and extent of the Invisible Web and offering pathfinders for accessing its content, aimed at novice and advanced web searchers. Chapters cover the development of the Internet, search engines and web directories, why search engines cannot see invisible web content, how to recognize it, and when to use it. A directory section lists more than 1,000 Invisible Web sites by topic.
Explains federated searching across government science databases often described as the deep web.
Federated search portal querying science databases and repositories across many countries.
