Cyclicity of graphs. - Richard H. Hammack (J. Graph Theory, 1999)

A note on the complexity of computing cyclicity. - Richard H. Hammack (Ars Comb., 2002)

Centers of n-fold tensor products of graphs. - Sarah Bendall; Richard H. Hammack (Discuss. Math. Graph Theory, 2004)

Centers of Tensor Products of Graphs. - Ghidewon Abay-Asmerom; Richard H. Hammack (Ars Comb., 2005)

Square contractions of graphs. - Richard H. Hammack (Australas. J Comb., 2006)

Minimum cycle bases of direct products of bipartite graphs. - Richard H. Hammack (Australas. J Comb., 2006)

Isomorphic components of direct products of bipartite graphs. - Richard H. Hammack (Discuss. Math. Graph Theory, 2006)

Fractional graphs. - Richard H. Hammack (Australas. J Comb., 2007)

Minimum cycle bases of direct products of complete graphs. - Richard H. Hammack (Inf. Process. Lett., 2007)

Total Perfect Codes in Tensor Products of Graphs. - Ghidewon Abay-Asmerom; Richard H. Hammack; Dewey T. Taylor (Ars Comb., 2008)

A cancellation property for direct product. - Richard H. Hammack (Discuss. Math. Graph Theory, 2008)

Factorial properties of graphs. - Ghidewon Abay-Asmerom; Richard H. Hammack; Dewey T. Taylor (Australas. J Comb., 2009)

Minimum cycle bases of direct products of graphs with cycles. - Zachary Bradshaw; Richard H. Hammack (Ars Math. Contemp., 2009)

On Cartesian skeletons of graphs. - Richard H. Hammack; Wilfried Imrich (Ars Math. Contemp., 2009)

On direct product cancellation of graphs. - Richard H. Hammack (Discret. Math., 2009)

Proof of a conjecture concerning the direct product of bipartite graphs. - Richard H. Hammack (Eur. J. Comb., 2009)

An isomorphism theorem for digraphs. - Laura J. Culp; Richard H. Hammack (Australas. J Comb., 2010)

The inner power of a graph. - Richard H. Hammack; Neal Livesay (Ars Math. Contemp., 2010)

A quasicancellation property for the direct product of graphs. - Richard H. Hammack (Discret. Math., 2010)

Cancellation of direct products of digraphs. - Richard H. Hammack; Katherine E. Toman (Discuss. Math. Graph Theory, 2010)

Direct Product Factorization of Bipartite Graphs with Bipartition-reversing Involutions. - Ghidewon Abay-Asmerom; Richard H. Hammack; Craig E. Larson; Dewey T. Taylor (SIAM J. Discret. Math., 2010)

Notes on the independence number in the Cartesian product of graphs. - Ghidewon Abay-Asmerom; Richard H. Hammack; Craig E. Larson; Dewey T. Taylor (Discuss. Math. Graph Theory, 2011)

On uniqueness of prime bipartite factors of graphs. - Richard H. Hammack (Discret. Math., 2013)

Frucht's theorem for the digraph factorial. - Richard H. Hammack (Discuss. Math. Graph Theory, 2013)

Cancellation of digraphs over the direct product. - Richard H. Hammack (Eur. J. Comb., 2013)

Fast recognition of direct and strong products. - Richard H. Hammack; Wilfried Imrich (Ars Math. Contemp., 2014)

Zero Divisors Among Digraphs. - Richard H. Hammack; Heather C. Smith (Graphs Comb., 2014)

A prime factor theorem for bipartite graphs. - Richard H. Hammack; Owen Puffenberger (Eur. J. Comb., 2015)

Associativity and Non-Associativity of Some Hypergraph Products. - Richard H. Hammack; Marc Hellmuth; Lydia Ostermeier; Peter F. Stadler (Math. Comput. Sci., 2016)

Cycle bases of reduced powers of graphs. - Richard H. Hammack; Gregory D. Smith (Ars Math. Contemp., 2017)

Neighborhood Reconstruction and Cancellation of Graphs. - Richard H. Hammack; Cristina Mullican (Electron. J. Comb., 2017)

Proper connection of direct products. - Richard H. Hammack; Dewey T. Taylor (Discuss. Math. Graph Theory, 2017)

Digraphs Products. - Richard H. Hammack (Classes of Directed Graphs, 2018)

Vertex-Transitive Direct Products of Graphs. - Richard H. Hammack; Wilfried Imrich (Electron. J. Comb., 2018)

Robust cycle bases do not exist for if. - Richard H. Hammack; Paul C. Kainen (Discret. Appl. Math., 2018)

Graph Bases and Diagram Commutativity. - Richard H. Hammack; Paul C. Kainen (Graphs Comb., 2018)

Sphere decompositions of hypercubes. - Richard H. Hammack; Paul C. Kainen (Art Discret. Appl. Math., 2020)

Palindromic products. - Richard H. Hammack; Jamie L. Shive (Art Discret. Appl. Math., 2021)

Graph exponentiation and neighborhood reconstruction. - Richard H. Hammack (Discuss. Math. Graph Theory, 2021)

A New View of Hypercube Genus. - Richard H. Hammack; Paul C. Kainen (Am. Math. Mon., 2021)

Euler's Theorem for Regular CW-Complexes. - Richard H. Hammack; Paul C. Kainen (Comb., 2024)