There are lots of commercial Non patent Literature databases available in the market but for the smaller companies doing the searching related to patents its tough to buy these databases as they are already have paid a lot for the patent databases like Micropatent, Thomson Innovation, QPat, Delphion, WIPS Global, Derwent and others.
They need some good and reliable Non Pantent Databases that can compliment their search and also are free. So some of the sources i liked most are
FreefullPDF.com
Google scholar
scitopia.org
IP.com
scirus.com
Though they give results most of the time free but sometimes you have to pay for the articles. Its sometime good when u find very good result and it is visible in its abstract..
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