Paul C. Leyland Arjen K. Lenstra Bruce Dodson Alec Muffett Samuel S. Wagstaff Jr. MPQS with Three Large Primes. 446-460 2002 conf/ants/2002 ANTS http://link.springer.de/link/service/series/0558/bibs/2369/23690446.htm db/conf/ants/ants2002.html#LeylandLDMW02