@article{1993-lenstra-2512 ,author={Arjen K. Lenstra and Hendrik W. Lenstra, Jr. and Mark S. Manasse and John M. Pollard} ,ISSN={0025--5718} ,journal={Mathematics of Computation} ,MR={93k:11116} ,pages={319--349} ,title={{The factorization of the ninth Fermat number}} ,volume={61} ,year={1993} }