Discrete and combinatorial mathematics - an applied introduction (3. ed.). - Ralph Grimaldi (Addison-Wesley, 1993)

Sequences. - Thomas A. Dowling; Ralph Peter Grimaldi; Jay Yellen; Victor S. Miller; Edward A. Bender (Handbook of Discrete and Combinatorial Mathematics, 1999)

The Frequency of Summands of a Particular Size in Palindromic Compositions. - Phyllis Z. Chinn; Ralph Grimaldi; Silvia Heubach (Ars Comb., 2003)

Binary Strings Without Odd Runs of Zeros. - Ralph Grimaldi; Silvia Heubach (Ars Comb., 2005)

Ternary Strings with no Consecutive 1's. - Ralph Grimaldi (Ars Comb., 2008)