1. A. Albano, G. Ghelli and R. Orsini, “Objects for a database programming language,” in 3rd Int. Workshop Database Programming Languages, Napflion, Greece, 1991.
2. P. America and F. Van de Linden, “A parrallel object-oriented language with inheritance and sub-typing,” Proceedings of ECOOP/IOOPSLA 90, October 21-25, 1990.
3. F. Banchilon, “Object-oriented database systems,” in 7th Symp. Principles of Database Systems, ACM, Austin, Texas, 1988, pp. 152–162.
4. P.A. Bernstein, V. Hadzilacos and N. Goodman, Concurrency Control and Recovery in Database Systems, Addison-Welsey: Reading, MA, 1987.
5. A. Bondavalli, N. De Francesco, D. Latella, and G. Vaglini, “Shared abstract data types: an algebraic methodology for their specification,” in MFDBS-89, LNCS 364, Budapest, 1989, pp. 53–67.