1. Beeri, C.: Query Languages for Models with Object-Oriented features. In: Advances in Object-Oriented Database Systems, A.Dogac, Springer-Verlag, 1994.
2. Busse,R., Müller,A., E.J.Neuhold: Information Handling — A Challenge for Databases and Expert Systems. Proc. of DEXA'93, Springer-Verlag, 1993.
3. Duží,M., Krejčí,F., Materna,P., Staníček,Z.: HIT Method of Data Base Design (a Functional Approach to Information Representation). Res. Rep., Technical Univ. Brno, 1986.
4. Duží,M., Materna,P.: Attributes: Distinguishing Capability versus Information Capability. Computers and AI, Vol. 9., 1990, No. 2, pp. 169–185.
5. Duong, T., Hiller, J., Srinivasan, U.: A Unifying Model of Data, Metadata and Context. Proc. of DEXA '93, Springer-Verlag, 1993.