E-prints
Non-peer reviewed papers,
very current, free.
The physics and astronomy communities have been pioneers in the use
of the Web for sharing pre-publication papers. E-print services bypass
the traditional publishing environment by posting papers on the Web
prior to journal acceptance and formal peer review. The advantages to
e-print services are: current research is available for anyone as soon
as it is submitted to the Web site; access is free worldwide; authors
maintain rights to their intellectual property. See: What
you should know about scholarly publishing
The primary source for e-prints: