Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. Released in beta in November 2004, the Google Scholar index includes most peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other scholarly literature, including court opinions and patents. While Google does not publish the size of Google Scholar's database, scientometric researchers estimated it to contain roughly 389 million documents including articles, citations and patents making it the world's largest academic search engine in January 2018. Previously, the size was estimated at 160 million documents as of May 2014. An earlier statistical estimate published in PLOS ONE using a Mark and recapture method estimated approximately 80–90% coverage of all articles published in English with an estimate of 100 million. This estimate also determined how many documents were freely available on the web.
ResearcherID is a TR solution to the author ambiguity problem within the scholarly research community. Each member is assigned a unique identifier to enable researchers to manage their publication lists, track their times cited counts and h-index, identify potential collaborators and avoid author misidentification. In addition, the ResearcherID information integrates with the Web of Science and is ORCID compliant, allowing you to claim and showcase your publications from a single one account. Search the registry to find collaborators, review publication lists and explore how research is used around the world!
WorldCat is the world's largest network of library content and services. WorldCat libraries are dedicated to providing access to their resources on the Web, where most people start their search for information.
OCLC, a global library cooperative, supports thousands of libraries in making information more accessible and more useful to people around the world.
ResearchBib is open access with high standard indexing database for researchers and publishers. Research Bible may freely index journals, research papers, call for papers, research position.
The LOCKSS Program, based at Stanford University Libraries, provides libraries and publishers with award-winning, low-cost, open source digital preservation tools to preserve and provide access to persistent and authoritative digital content.
The PKP Index is a database of articles, books, and conference proceedings using PKP's free, open source Open Journal Systems, Open Monograph Press, and Open Conference Systems software applications. The PKP Index includes 394230 records indexed from 1495 publications.
The ICI World of Journals gathers information regarding scientific journals from various sources. Thus, we share comprehensive information regarding the scope of journals' activity, editorial offices and articles published by the scientific journals. International journals from all over the world may register in the ICI World of Journals - a dedicated system has been made available to manage the Journal's Passport.
The CiteFactor server provides indexing of major international journals and proceedings. Author can get information about international journal impact factor, proceedings (research papers) and information on upcoming events. All the journal pages have pointers to Web pages of the publishers which are integrated into the CiteFactor stream pages.
is Journals metadata archive... To improve the accuracy of searching within the Indexed Journals System, authors have been asked to index their work, where applicable, by discipline(s), topics, genre, method, coverage, and sample. This allows you to search for "empirical" versus "historical" studies, for example, under "index terms." You can also view a document's index terms by selecting the complete record from among the search results.
is an international, recognized platform for promoting scientific achievements, as well as supporting publishers and scientific communities interested in state-of-the art research activities in innovation and applied science areas.