Some useful links:

Ferdowsi university of Mashhad (FUM): http://www.um.ac.ir

IPM: http://physics.ipm.ac.ir/

Particle Physics Group at FUM: http://sites.google.com/site/fupphysicsgroup/

ArXive: http://arxiv.org/

Spires: http://www.slac.stanford.edu/spires/

String theory Wiki: http://www.stringwiki.org/wiki/String_Theory_Wiki

String theory website: http://www.superstringtheory.com