Scitation
http://scitation.aip.org/

Discover more than one million documents from scholarly journals, magazines, conference proceedings, and other special publications from prestigious scientific societies and technical publishers. Make Scitation your own portal for research and content discovery. Signing up for MyScitation is free, and registered users gain access to their exclusive set of personalization tools. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This has been added to Academic Resources Internet MiniGuide. This has been added to Academic and Scholar Search Engines and Sources White Paper.