The Online Computer Library Center (OCLC) has published this paper on e-book circulation. The study by Lynn Silipigni Connaway and Justin Littman is called "A Circulation Analysis Of Print Books And e-Books In An Academic Research Library." The study compared the usage of books available in both print and e-book format at the Duke University Libraries. They found that e-books received 11 percent more usage than the books in print, but also observed incongruity between print circulations and e-book access. Although they note that the findings cannot be generalized, they do offer some implications from the study for e-book development and the study of e-book usage in academic libraries.