Xia J, Myers RL, Wilhoite SK. Multiple open access availability and citation impact. Journal of Information Science 2011;37:19-28
The research examines the relationship between open access (OA) availability of journal articles and the citation advantage by collecting data of OA copies and citation numbers in 20 top library and information science journals. A correlation is discovered between the two variables: multiple OA availability of an article has a positive impact on its citation count.