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2. J. Franke, T. Kleinjung et al., RSA-576, E-mail announcement, 2003. \url{http://www.crypto-world.com/announcements/rsa576.txt}
3. The number field sieve: an annotated bibliography;Lenstra, H. W., Jr.,1993
4. On quadratic polynomials for the number field sieve;Murphy, Brian,1998
5. Modelling the yield of number field sieve polynomials;Murphy, Brian,1998