References
- Bernius S. The impact of open access on the management of scientific knowledge. Online Information Review 2010;34:583-603.
- http://www.google.com/analytics (September 27, 2013)
- Eysenbach G. Can tweets predict citations? Metrics of social impact based on Twitter and correlation with traditional metrics of scientific impact. J Med Internet Res 2011;13(4):e123.