1. Lect Notes Comput Sci;C. H. Bennett,1985
2. J. H. Conway. On numbers and games. Academic Press Inc., London, U.K., 1976.
3. Y. Desmedt. Major security problems with the “unforgeable” (Feige-)Fiat-Shamir proofs of identity and how to overcome them. In Securicom 88, 6th worldwide congress on computer and communications security and protection, pp. 147–159. SEDEP Paris France, March 15–17, 1988.
4. Lect Notes Comput Sci;Y. Desmedt,1988
5. A. Einstein. Relativitätstheorie. Friedr. Vieweg, Braunschwig, 1916.