“Studies on access: a review” by Philip M. Davis (20th Dec 2009) is a… “review of the empirical literature on access to scholarly information. This review focuses on surveys of authors, article download and citation analysis”. From the conclusion…

“There is a dearth of research on whether free access to the scientific literature is making a difference in non-research contexts, such as in teaching, medical practice, industry and government policy making.”

   [ Hat-tip: Open Access News ]