Author = {Fernando Bobillo and Umberto Straccia}, 
 Booktitle = {Proceedings of the 13th World Congress of the International Fuzzy Systems Association and 6th Conference of the European Society for Fuzzy Logic and Technology (IFSA-EUSFLAT 2009)}, 
 Editor = {Jo\~{a}o P. B. Carvalho and Didier Dubois and Uzay Kaymak and Jo\~{a}o M. C. Sousa}, 
 Month = {July}, 
 Pages = {189--194}, 
 Title = {Fuzzy Description Logics with Fuzzy Truth Values}, 
 Year = {2009}}