Chaos and fractals on your personal computer. - Ralph Walde; Ralph A. Morelli (J. Comput. High. Educ., 1989)

A java API for historical ciphers: an object-oriented design project. - Ralph A. Morelli; Ralph Walde; Gregg Marcuccio (SIGCSE, 2001)

A Word-Based Genetic Algorithm for Cryptanalysis of Short Cryptograms. - Ralph A. Morelli; Ralph Walde (FLAIRS, 2003)

A Study of Heuristic Approaches for Breaking Short Cryptograms. - Ralph A. Morelli; Ralph Walde; William Servos (Int. J. Artif. Intell. Tools, 2004)

Evolving Keys for Periodic Polyalphabetic Ciphers. - Ralph A. Morelli; Ralph Walde (FLAIRS, 2006)