World's leader research work websites

World Academy of science and engineering technology

http://www.waset.org/

Wiley online library

http://onlinelibrary.wiley.com/subject/code/000073

Science Direct

http://www.sciencedirect.com/

IEEE xplore digital library

http://ieeexplore.ieee.org/Xplore/home.jsp?tag=1

ACM Digital library

http://portal.acm.org/dl.cfm

ACS Publications

http://pubs.acs.org/search/advanced

Thomson Reuters

http://scientific.thomsonreuters.com/cgi-bin/jrnlst/jloptions.cgi?PC=K

Scitation

http://scitation.aip.org/