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Scirus
Search engine that fetches only scientific websites.
http://www.scirus.com/srsapp/
iSpecies
A species search engine from Rod Page of Glasgow University. Search on either the common or Latin name of a species. Results are generated by querying other data sources.
http://darwin.zoology.gla.ac.uk/~rpage/isp...
CiteSeer: The NEC Research Institute Scientific Literature Digital Library
Aims to improve the dissemination and feedback of scientific literature, and to provide improvements in functionality, usability, availability, cost, comprehensiveness, efficiency, and timeliness. Rather than creating just another digital library, CiteSeer provides algorithms, techniques, and software that can be used in other digital libraries. CiteSeer indexes Postscript and PDF research articles on the Web, and provides a number of special features.
http://citeseer.ist.psu.edu/
SciSeek
Science search engine and directory. Also provides forums, tools and related news.
http://www.sciseek.com/
Online Journals Search Engine
A multi-search tool that permits queries of a number of scientific journals.
http://www.ojose.com/
ISI Highly Cited
A search tool to identify individuals, departments and laboratories that have made fundamental contributions to the advancement of science and technology in recent decades.
http://isihighlycited.com/
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