Objective Nowadays, the web is rapidly spreading, playing a significant role in the marketing
or sale or distribution of “quasi” legal drugs, hence facilitating continuous changes in drug …

The World Wide Web, or the Web, is a network of interconnected sites and hyperlinks
between them. New structures can be added to this web by creating hyperlinks that have a …

This paper examines how the deep Web, ie, Web sites that are not indexed and thus are not
accessible through Web search engines, was described and represented in British …

Web crawling, a process of collecting web pages in an automated manner, is the primary
and ubiquitous operation used by a large number of web systems and agents starting from a …

The amount of information contained in databases available on the Web has grown
explosively in the last years. This information, known as the Deep Web, is heterogeneous …

The imaginary of the Deep Web is commonly associated with crime, crypto markets and
immoral content. However, the best-known Deep Web system, the Tor Network, is a …

Se puede afirmar que internet es un Sistema de Información distribuido en una especie de
edificio y que, para acceder a la información, se debe navegar por pisos repletos de ella. La …

The deep web refers to content that is hidden behind HTML forms. The deep web contains a
large collection of data that are unreachable by link-based search engines. A study …

The World Wide Web is a very diversified information space. While it contains a large
amount of textual and multimedia content, a significant part of Web information is semi …

Offering database content to unknown Web users creates two problems. First, users need to
know about its existence. Second, once they know that it exists, they need to be able to …