On minimizing testing rounds for fault identification. - Edward F. Schmeichel; S. Louis Hakimi; M. Otsuka; Geoff Sullivan (FTCS, 1988)

A Parallel Fault Identification Algorithm. - Edward F. Schmeichel; S. Louis Hakimi; M. Otsuka; Geoff Sullivan (J. Algorithms, 1990)

Enigma Variations: an Extended Family of Machines. - David H. Hamer; Geoff Sullivan; Frode Weierud (Cryptologia, 1998)

The Swiss NEMA Cipher Machine. - Geoff Sullivan; Frode Weierud (Cryptologia, 1999)

The ECM Mark II: Some Observations on the Rotor Stepping. - Geoff Sullivan (Cryptologia, 2002)

Cryptanalysis of Hagelin Machine Pin wheels. - Geoff Sullivan (Cryptologia, 2002)

Purple Revealed: Simulation and Computer-Aided Cryptanalysis of Angooki Taipu B. - Wes Freeman; Geoff Sullivan; Frode Weierud (Cryptologia, 2003)

Breaking German Army Ciphers. - Geoff Sullivan; Frode Weierud (Cryptologia, 2005)