1Tenopir C.A flurry of sales.Libr J,2007,132(4):29-31.
2Tenopir C,Baker G,Grogg JE.The information industry added value with unique content and custem tools as large search engines entered the market.Libr J,2007,132(9):34-38.
4Periodical pricing survey: change is happening, but serial prices still rising. [2005-06-20]. http://ic-server02.info-commons. uiowa.edu/scholar/archives/137/.
5Van Orsdel LC, Born K. Choosing sides-periodical price survey 2005. [2005-06-28]. http://www.libraryjournal.com/article/CA516819. html.
6Directory of open access journals. [2005-11-26]. http://www.doaj.org.
7The public library of science (PloS), [2005-07-15]. http://www.publiclibraryofscience.org/.
8About Google scholar. [2005-08-26]. http://scholar.google. com/scholar/about. html.
9Serials price projections and cost history. [2005-09-06]. http://www. ebsco.com/home/printsubs/priceproj, asp.
10Van Orsdel LC,Born K.Journals in the time of Google.Libr J,2006,131(7):39-44.
