1. (a) Astronomy, August 1999, January 2001;
2. (b) Discover, February 1996, pp. 38–45.
3. Superstring: A Theory of Everything?;Davies,1988
4. Encarta CD Electronic Encyclopedia; Guiness Book of Records 2001.
5. Diophantus: Introduction to Mathematical Philosophy (With Probabilistic Solution of Fermat and Other Applic.);Escultura,1993