I used the advanced search function. In the exact phrase box, I searched for digital libraries, and I searched for all of the words virtual reference. I also limited my search to the years 2008-2012. I restricted my search to the Social Sciences, Arts, and Humanities and Engineering, Computer Science, and Mathematics sections.
World of Knowledge
I searched for Topic = "digital librar*" and virtual reference. I limited my scope to computer science and library information science. I also restricted the years to 2008-2012.
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