1. http://en.wikipedia.org/wiki/PLOS_ONE (accessed July 14, 2014).
2. http://www.plosone.org/static/publication.action (accessed July 14, 2014).
3. Predatory publishers are corrupting open access;Beall;Nature,2012
4. http://scholarlyoa.com/publishers/ (accessed July 14, 2014).