- Richard P. Brent, Peter L. Montgomery, Herman J. J. te Riele, Henk Boender, Stephania Cavallar, Conrad Curry, Bruce Dodson, Jens Franke, Joseph Leherbauer, George Sassoon, and Robert Silverman, Factorizations of cunningham numbers with bases 13 to 99: millennium edition, Report – Modelling, Analysis and Simulation, vol. 7, Centrum voor Wiskunde en Informatica, Amsterdam, 2001, pp. i-viii, pp. 1-19.