Mathematics & Computer Science

Journals, books, and other resources containing new contributions to mathematical research. In addition, includes data on advanced-level textbooks and expository papers that may not contain new research, but are of interest to scholars and research mathematicians.1940 to present.

Journal articles, books, and other resources across many subjects. Provides a "cited by" feature to indicate other papers containing a source paper as a reference.

Google Scholar - "Invalid Domain for Site Key" ErrorGoogle reCaptcha Error

In an effort to optimize user experience during peak activity, Google Scholar may prompt Northern Michigan University patrons to complete a reCAPTCHA widget to verify their non-robot status. Unfortunately, a security glitch in Google's widget may result in an "Invalid domain for site key" error for patrons accessing the Library's off-campus proxy server.


If you possess a Google Account, you can integrate it with the Library using the following steps:

  1. Visit the un-proxied version of Google Scholar at
  2. Click the "Sign In" button and log in with your NMU account (
  3. From the menu icon (three bars at the top left), select "Settings," then choose "Library Links."
  4. In the Library Links section of the Settings menu, confirm that "Northern Michigan University - Get it@NMU," is selected.
  5. If it is not already selected, search for Northern Michigan University in the search bar. Then, select the checkbox next to "Northern Michigan University - Get it@NMU," click the "Save" button in the lower right.

Once saved, you can return to the Google Scholar homepage. You should now be able to explore Google Scholar without utilizing NMU's off-campus proxy, while still having access to the "Get it@NMU" links directing you to our full-text databases.

If the provided workaround does not resolve your Google Scholar access issues, we recommend patience, as Google typically resets the faulty reCAPTCHA requirement after approximately 24 hours.

arXiv Mathematics 
An open access repository of electronic preprints approved for posting after moderation, but not full peer review. It consists of scientific papers in the fields of mathematics, physics, astronomy, electrical engineering, computer science, etc. In many fields of mathematics and physics, almost all scientific papers are self-archived on the arXiv repository.

arXiv Computer Science
A highly-automated electronic archive and distribution server for research articles. Covered areas include mathematics, physics, astronomy, electrical engineering, computer science, etc. Users can retrieve papers from arXiv via the web interface.

A multi-disciplinary full-text database, with more than 7,300 full-text, peer-reviewed journals. This database also offers indexing and abstracts for more than 12,500 journals and other publications. Brought to you by the Library of Michigan via the Michigan eLibrary (

ProQuest Central brings together databases across major subject areas including Business, Health and Medical, Language and Literature, Social Sciences, Education, Science and Technology, as well as core titles in the Performing and Visual Arts, History, Religion, and Philosophy. Also includes thousands of full-text newspapers from around the world.

Most comprehensive science-specific search engine, but most articles not available for free.

Indexes published and unpublished sources on thousands of educational topics.

Complete, searchable, full text articles from over 2,100 core scholarly journals. 1878 to the most recent 1-5 years (varies by title).

Scholarly reference books across a variety of subjects.

Journal articles, newspapers, and reports covering all aspects of business. Direct company link to Hoover's company information & analysis. 1971 to present.

A collection of electronic books dealing with computers and information technology. Close to 7,000 titles. Access limited to 2 concurrent users per title. Please logout when finished using.
Basic math formulas and tables. This site contains tutors for algebra, geometry and calculus. There is also a glossary of mathematical terms.

Extensive megasite for mathematics.

A list of about 320 algorithms from the Royal Statistical Society.

Visual Calculus
A collection of modules that can be used in the study of calculus.

Free Math Worksheets
Includes over 6000 free math worksheets with answer keys.

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