Tiling and recursion. - I-Ping Chu; Richard Johnsonbaugh (SIGCSE, 1987)

Converses of pumping lemmas. - Richard Johnsonbaugh; David P. Miller (SIGCSE, 1990)

A graph generation software package. - Richard Johnsonbaugh; Martin Kalin (SIGCSE, 1991)

The four-peg Tower of Hanoi puzzle. - I-Ping Chu; Richard Johnsonbaugh (ACM SIGCSE Bull., 1991)

A real-time people counter. - Gary Conrad; Richard Johnsonbaugh (SAC, 1994)

Min-Plus Matrix Multiplication: 10834. - Sung Soo Kim; Richard Johnsonbaugh; Ronald E. Prather; Donald E. Knuth (Am. Math. Mon., 2002)