1. M. Albrecht, M. Altus, E. Buchholz, A. Düsterhöft, and B. Thalheim, The rapid application and database development (RADD) workbench-A comfortable database design tool. In: Proc. of the 7th International Conference, CAiSE 95 (Eds.: J. Ivari, K. Lyytinen, M. Rossi), LNCS 932, Jyväskylä, Finland, 1995, p.327–340. http://www.informatik.tu-cottbus.de/cs/dbis/radd/caise95/caise95.html.
2. M. Albrecht, M. Altus, and M. Steeg, Conceptual Data Modeling, Implementation Prototyping, Transformation, and Application Design-An Animating Approach using RADD. ADBIS'97 in St.-Petersburg, September.
3. M. Altus, Meta-Modelling of Conceptual Data Base Design Using a Plausibility Function. In: Procs of the 6th European-Japanese Seminar on Information Modelling and Knowledge Bases, May 28–31, 1996. http://www.informatik.tucottbus.de/~altus/node4.html.
4. C. Batini, S. Ceri, and S. Navathe, Conceptual database design, An entity-relationship approach. Benjamin Cummings, Redwood, 1992.
5. P. Bunemann and Atsushi Ohori. Polymorphism and Type Inference in Database Programming. ACM ToDS, 21(1):30–76, March 1996.