1. Bougnol, M. L., & Dulá, J. H. (2006). Validating DEA as a ranking tool: An application of DEA to assess performance in higher education. Annals of Operations Research, 145, 339–365.
2. Bougnol, M. L., & Dulá, J. H. (2013). A mathematical model to optimize decisions for climbing in multi-attribute rankings. Scientometrics, 95, 785–796.
3. Casper, G., Criticism of College Rankings. (1996). Private letter to the editor of USNWR. http://www.stanford.edu/dept/pres-provost/president/speeches/961206gcfallow.html . Accessed March 2014.
4. Center for World-Class Universities (CWCU), Graduate School of Education of Shanghai Jiao Tong University. (2013). Academic Ranking of World Universities. http://www.shanghairanking.com/ARWU2013.html . Accessed April 2014.
5. CWTS Leiden ranking. (2013). http://www.leidenranking.com/ranking . Accessed April 2014.