This service covers free, full text, quality controlled scientific and scholarly journals. We aim to cover all subjects and languages. from web site
Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations. Google Scholar helps you identify the most relevant research across the world of scholarly research.
Project Euclid's mission is to advance scholarly communication in the field of theoretical and applied mathematics and statistics. Full-text searching, reference linking, interoperability through the Open Archives Initiative, and long-term retention of data are all important components of the project. from web site