Matrices Permutable to * Matrices. - Roger C. Entringer; Douglas E. Jackson (J. Comb. Theory A, 1971)

On Nonrepetitive Sequences. - Roger C. Entringer; Douglas E. Jackson; J. A. Schatz (J. Comb. Theory A, 1974)

Minimum graphs with complete k-closure. - Lane H. Clark; Roger C. Entringer; Douglas E. Jackson (Discret. Math., 1980)