[English Version]
arXiv.org https://arxiv.org or mirror: http://cn.arxiv.org
Elsevier(Nuclear Physics, Physics Report etc, only after 1995 are available):
http://www.sciencedirect.com
JHEP: http://iopscience.iop.org/journal/1126-6708
Guide to Review Articles:
SPIRES guide to the review literature in High-Energy Physics:
Literature Search - INSPIRE (inspirehep.net)