1. Baeza-Yates, R., Ribeiro-Neto, B.: Modern information retrieval. Addison-Wesley, UK (1999)
2. Basili, V., Caldiera, G.: Rombach. The goal question metric paradigm. Wiley, New York (1994)
3. Basili, V.R., Selby, R.W., Hutchens, D.H.: Experimentation in software engineering. IEEE Transact. Softw. Eng. 12(7), 758–773 (1986)
4. Batra, D., Hoffer, J., Bostrom, R.: Comparing representations with relational and eer model. Commun. ACM 33(2), 128–139 (1990)
5. Bavota, G., Gravino, C., Oliveto, R., De Lucia, A., Tortora, G., Genero, M., Cruz-Lemus, J.: UML vs ER - experimental material. http://distat.unimol.it/reports/ERvsUML/ (2012)