**Zentralblatt MATH**: “The World’s Most Complete and Longest Running Abstracting and Reviewing Service in Pure and Applied Mathematics.”**Jahrbuch Database**: Electronic Research Archive for Mathematics**EULER**: Portal to Mathematics Publications**E-Print ArXiv**: “A fully automated electronic archive and distribution server for research papers. It covers areas such as mathematics, non-linear sciences, and computer science. Freely accessible for everyone.”**Project Euclid**: “A user-centered initiative to create an environment for the effective and affordable distribution of serial literature in mathematics and statistics.

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