The graph of generating sets of an abelian group Persi Diaconis; Ronald Graham — 1999 Colloquium Mathematicae
Guessing secrets. Chung, Fan; Graham, Ronald; Leighton, Tom — 2001 The Electronic Journal of Combinatorics [electronic only]
Improving dense packings of equal disks in a square. Boll, W.David; Donovan, Jerry; Graham, Ronald L.; Lubachevsky, Boris D. — 2000 The Electronic Journal of Combinatorics [electronic only]