Conrad, Brian, Edixhoven, Bas, Stein, William (2003)

Documenta Mathematica

Paul van Wamelen (2002)

Acta Arithmetica

Odlyzko, Andrew, Rubinstein, Michael, Wolf, Marek (1999)

Experimental Mathematics

Butler, Steve, Graham, Ron, Zang, Nan (2008)

Journal of Integer Sequences [electronic only]