1. Di Nola A, Georgescu G, Iorgulescu A (2002) Pseudo BL-algebra: Part I. Mult Val Logic 8(5–6):673–714
2. Di Nola A, Leustean L (2002) Compact representations of BL-algebra. Department of Computer Science, University Aarhus. BRICS Report Series
3. Hajek P (1988) Metamathematics of Fuzzy Logic. Kluwer Academic Publishers, Dordrecht, 1988.
4. Haveshki M, Borumand Saeid A, Eslami E A topology induced by uniformity on BL-algebras (Submitted)
5. Iorgulescu A (2004) Classes of BCK algebra - Part III. Preprint Series of the Institute of Mathematics of the Romanian Academy, preprint nr. 3/2004, 1–37