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An article index is like Google Search if it only searched journal articles. Below you will find several article indexes that should help you find your primary scientific research article.
Sciences and social sciences journal articles. CogPrints
ArXiv.org
OAI
US Patent and Trademark Office (USPTO)
European Patent Office
Japan Patent Office
World Intellectual Property Organization (WIPO)
UK Intellectual Property Office
SCOPUS offers coverage from 14,000 peer-reviewed titles from over 4,000 international publishers including 531 Open Access journals. in addition Scopus offers coverage of relevant scientific information on the Web, including author homepages, university sites, corporate information and other resources such as Preprint servers, CogPrints, ArXiv.org, OAI compliant resources, as well as the US Patent and Trademark Office (USPTO), the European Patent Office, the Japan Patent Office, the World Intellectual Property Organization and the UK Intellectual Property Office.
Medical research journal articles. National Library of Medicine's version of Medline. Mid 1950s to present general science
chemistry
medicine
nursing
dentistry
veterinary medicine
health care system
preclinical sciences
PubMed is a database of citations and abstracts for millions of articles from thousands of journals in the areas of general science, chemistry, medicine, nursing, dentistry, veterinary medicine, the health care system, and the preclinical sciences. It includes links to full-text articles at several thousand journal web sites as well as to most of the articles in PubMed Central. PubMed does not have citations for certain types of PubMed Central material, such as book reviews.