Christian G. Fermüller Fuzzy Logic and Theories of Vagueness. 17-17 2007 EUSFLAT Conf. (1) http://www.eusflat.org/publications/proceedings/EUSFLAT_2007/papers/(A8)_Fermuller.pdf conf/eusflat/2007-1 db/conf/eusflat/eusflat2007-1.html#Fermuller07