F. Filippidis, I. Agaku, and C. Vardavas. The European Journal of Public Health, 25 (5):
814-818(2015)First published online: March 30, 2015, http://dx.doi.org/10.1093/eurpub/ckv068. (Eurobarometer).
C. Vardavas, F. Filippidis, and I. Agaku. Tobacco Control, 24 (5):
442-448(2015)First published online: June 16, 2014, http://dx.doi.org/10.1136/tobaccocontrol-2013-051394. (Eurobarometer).
D. Tsarkov, and I. Horrocks. Proc. of the Int. Joint Conf. on Automated Reasoning (IJCAR 2006), volume 4130 of Lecture Notes in Artificial Intelligence, page 292--297. Springer, (2006)