Gardner 1956 Mathematics Magic and Mystery

Donovan 2004 THE BREAKING OF THE JN25 SERIES OF CIPHERS 1939 – 1945

Gardner 1995 the New Ambidextrous Universe

Gardner 1987 Riddles of the Sphinx and Other Mathematical Puzzle Tales

Gardner 1991 Fractal Music, Hypercards and More

1977 Cracking a Random Number Generator

1982 a Basic Probe of the Beale Cipher

2000 Recovering the Wiring of Enigma's. UMKEHRWALZE A

2005 Breaking German Army Ciphers

2006 How I Broke the Confederate Code (137 Years Too Late)

2011 Operation Stonka. an Ultimate Deception Spy Game

2012 Location Authentication, Tracking, And Emergency Signaling Through Power Line Communication

Donovan 2014 Alan Turing, Marshall Hall, And the Alignment of WW2 Japanese Naval Intercepts