1. Artale, A., Calvanese, D., Kontchakov, R., Zakharyaschev, M.: The DL-Lite family and relations. J. of Artificial Intelligence Research 36, 1–69 (2098)
2. Lecture Notes in Computer Science;F. Baader,2009
3. Baader, F., Brandt, S., Lutz, C.: Pushing the
$\mathcal{EL}$
envelope. In: Kaelbling, L., Saffiotti, A. (eds.) Proc. 19th Int. Joint Conf. on Artificial Intelligence, IJCAI 2005, pp. 364–369. Professional Book Center (2005)
4. Baader, F., Brandt, S., Lutz, C.: Pushing the
$\mathcal{EL}$
envelope further. In: Clark, K.G., Patel-Schneider, P.F. (eds.) Proc. OWLED 2008 DC Workshop on OWL: Experiences and Directions. CEUR Workshop Proceedings, vol. 496, CEUR-WS.org (2008)
5. Baader, F., Calvanese, D., McGuinness, D., Nardi, D., Patel-Schneider, P. (eds.): The Description Logic Handbook: Theory, Implementation, and Applications, 2nd edn. Cambridge University Press, Cambridge (2007)