1. Belluce, P., Di Nola, A., Lettieri, A.: Local MV-algebras. Rend. Circ. Mat. Palermo 42, 347–361 (1993)
2. Cignoli, R., D’Ottaviano, I.M.L., Mundici, D.: Algebraic Foundations of Many-valued Reasoning. Kluwer, Dordrecht (2000)
3. Diaconescu, D., Flaminio, T., Leuştean, I.: Lexicographic MV-algebras and lexicographic states (submitted)
4. Di Nola, A., Ferraioli, A.R., Gerla, B.: Combining Boolean algebras and ℓ-groups in the variety generated by Chang’s MV-algebra. Mathematica Slovaca (accepted)
5. STUDFUZZ;A. Nola Di,2000