Graham, Ron and Pomerance, Carl. "Preface to the John Selfridge Memorial Issue" Integers, vol. 12, no. 6, 2012, pp. 1091-1091. https://doi.org/10.1515/integers-2012-0030
Graham, R. and Pomerance, C. (2012) Preface to the John Selfridge Memorial Issue. Integers, Vol. 12 (Issue 6), pp. 1091-1091. https://doi.org/10.1515/integers-2012-0030