## How to search for scientific papers: Which search utilities to use?

In the stupid quest to know everything about a subject, i just wonder if there exist databases out there that include all the existing journals to search for an specific topic.

I currently use Science Direct, but that is restricted only to Elsevier journals. For example, it does not include papers in Nature, Science, or Physical Reviews, which I have to search in each individual website. What utilities are available to search across the most journals?

I have hear about Web of Science, but haven't tried it. Which databases or journal search utilities do you use and recommend?
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 Recognitions: Gold Member You might want to search arXiv. Lots of stuff gets self-published there, but if you confine your self to papers that say "accepted for publication by XXX" or similar you'll still have a lot on your plate. Another option to dig deeply into a specific subject is to use CiteBase, and follow citations so that you can see papers that reference the ones you're most interested in.
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## How to search for scientific papers: Which search utilities to use?

There is not a "universal library" yet, so I use a few in addition to arXiv:

http://prola.aps.org/
http://www.opticsinfobase.org/
http://www.iop.org/EJ/
http://www.ncbi.nlm.nih.gov/sites/entrez?db=PubMed
http://naca.larc.nasa.gov/search.jsp
http://www.dtic.mil/dtic/
http://www.jstor.org/
http://journalseek.net/
 Recognitions: Gold Member Science Advisor Scholar that robphy linked to is actually very good and is what I use most of the time when I am searching for informaiton nowadays. I also have access to Web of Science which *should* be better than Scholar given that it is a commerical service, but I rarely use it unless I am looking for somethin specific (or want to know how many times one of my papers have been cited etc).