1. Lect Notes Comput Sci;J.N.E. Bos,1993
2. N. de Brujin, C. A. van Ebbenhorst Tengebergen, and D. R. Kruyswijk, “On the set of divisors of a number,” Nieuw Arch. Wisk, vol. 23, pp. 191–193, 1952.
3. Lect Notes Comput Sci;S. Even,1990
4. W. Feller, An Introduction to Probability Theory and Its Applications, vol. II., second corrected printing, Wiley & Sons, 1966.
5. L. Lamport, Constructing digital signatures from a one-way function, Technical Report SRI Intl. CSL 98, 1979.