1. R. D. Bergeron, W. Cody, W. Hibbard, D. T. Kao, K. D. Miceli, L. A. Treinish, and S. Walther. Database Issues for Data Visualization: Developing a Data Model. In J. P. Lee and G. G. Grinstein, editors, Database Issues for Data Visualization, number 871 in Lecture Notes in Computer Science, pages 3–15. Springer-Verlag, 1994.
2. R. D. Bergeron and G. G. Grinstein. A Reference Model for the Visualization of Multi-dimensional Data. In Proceedings of Eurographics '89, Hamburg, F. R. G., September 1989. North Holland Publishing Company.
3. CIE. CIE Recommendations on Uniform Color Spaces — Color Difference Equations, Psychometric Color Terms. Bureau Central de la CIE, Paris, France, 1978. CIE Publication No. 15 (E-13.1) 1971 / (TC-1.3) 1978, Supplement No. 2, 9–12.
4. EECS Department, University of California, Berkeley, California. The POSTGRES 4.0 References, 1992.
5. P. Di Gianantonio. A Functional Approach to Computability on Real Numbers. PhD thesis, University of Pisa, 1993.