1. Lecture Notes in Computer Science;Y. Akama,1993
2. Altenkirch, T., Dybjer, P., Hofmann, M., Scott, P.J.: Normalization by evaluation for typed lambda calculus with coproducts. In: LICS, pp. 303–310 (2001)
3. Barbanera, F., Dezani-Ciancaglini, M., De’Liguoro, U.: Intersection and union types: syntax and semantics. Inf. Comput. 119(2), 202–230 (1995)
4. Capitani, B., Loreti, M., Venneri, B.: Hyperformulae, Parallel Deductions and Intersection Types. BOTH, Electr. Notes Theor. Comput. Sci. 50(2), 180–198 (2001)
5. Lecture Notes in Computer Science;R. Cosmo Di,1993