Question: 1. D. C. Tsikriktsis and la M. Interstress, "Directions in 00 Research." In reference [22.9]. This paper lends further weight to the contention of the present writer that 00 database technology is a long way from consensus: "There are disagreements on basic definitions; e.g., what is an object? ... There is no reason to worry: Loose definitions are inevitable and sometimes welcome during a dynamic period of scientific discovery. They should and will become more rigorous during a period of consolidation that will inevitably follow." But 00 concepts have been around for well over 25 years! (see reference [22.4]).
2. Stanley B. Zdonik and David Maier (eds.). Readings in Object-Oriented Database Sys-tems. San Mateo, Calif.: Morgan Kaufmann (1990).
3. Gottfried Vossen. Data Models, Database Languages, and Database Management Sys-tems. Reading, Mass.: Addison-Wesley (1991).