MethodsBASE
http://www.methodsbase.com
Chemical structures, reactions, & publications
http://www.beilstein/com/products/xfire
Chemical literature.
http://www.cas.org/SCIFINDER/SCHOLAR
Mathematics literature
http://zb.msri.org/ ZMATH/
http://www.ams.org/mathscinet
Friday, September 12, 2008
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