Indexing

Catalogs and Search Engines

Directory of Open Access Journals (DOAJ) is an online directory that indexes and provides access to high quality, open access, peer-reviewed journals covering all areas of science, technology, medicine, social science and humanities. This directory has index of about 2 million articles from more than 10,000 journals of open-access publishers from 134 countries.
The project defines open access journals as scientific and scholarly journals that meet high quality standards by exercising peer review or editorial quality control and use a funding model that does not charge readers or their institutions for access.

OpenAIRE (Open Access Infrastructure for Research in Europe) is a large-scale European electronic infrastructure and a non-profit organization that provides open access to research results. It brings together repositories, journals, and data from across Europe, supporting the principles of Open Science and FAIR data.

BASE (Bielefeld Academic Search Engine) is one of the world’s largest search engines specializing in open access academic documents. It was developed by the Bielefeld University Library (Germany) and indexes metadata from millions of scholarly materials, such as articles, preprints, dissertations, and books.

WorldCat is the world’s largest international union catalog, containing over 240 million records of books, articles, videos, and other materials from more than 72,000 libraries across 171 countries.

Google Scholar is a free search engine that specializes in indexing the full texts of scholarly publications, including articles, dissertations, books, preprints, and technical reports across various disciplines. It allows researchers to search for literature, track citations of their work, and create their own author profiles.

EZB (Elektronische Zeitschriftenbibliothek) is a large electronic library of scholarly journals designed for fast and convenient access to full-text articles. It offers a structured interface for searching more than 100,000 e-journals across all fields of knowledge. The service is maintained by the University of Regensburg Library (Germany) and brings together over 600 libraries.