Scopus
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http://www.scopus.com/
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crossref.org : : dois for research content
Collaborative linking service which enables scholarly publishers to link reference citations to the online content cited by those references. Operated by Publishers International Linking Association (PILA).
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Galaxy of Knowledge | Smithsonian Institution Libraries
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Librarians' Internet Index
Librarian selected and annotated index to the Internet, updated weekly.
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Pubget: the search engine for life-science PDFs
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CiNii - NII論文情報ナビゲータ
Can't display Full text PDF in PPV with Safari4 (June 11, 2009) ... NII. Copyright © 2005-2009 National Institute of Informatics. All Rights Reserved. ...
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JournalSeek - A Searchable Database of Online Scholarly Journals
A searchable database of online scholarly journals.
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All Academic Inc. (Abstract Management, Conference Management and Research Search Engine)
Provides free academic searches of the Internet. Authors can index academic work as well.
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Wolfram|Alpha
Wolfram|Alpha gives you access to the world's facts, without searching. See what everyone is talking about.
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ProQuest
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100 Time-Saving Search Engines for Serious Scholars | Online Universities
While burying yourself in the stacks at the library is one way to get some ... Start off your research with one of these more general academic search engines. ...
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