Counting Subgroups of the Hecke Groups. - Benjamin Fine; Dennis Spellman (Int. J. Algebra Comput., 1993)

Almost Locally Free Groups and a Theorem of Magnus: Some Questions. - Anthony M. Gaglione; Seymour Lipschutz; Dennis Spellman (Groups Complex. Cryptol., 2009)

Reflections on some aspects of infinite groups. - Benjamin Fine; Anthony M. Gaglione; Gerhard Rosenberger; Dennis Spellman (Groups Complex. Cryptol., 2014)

An application of elementary real analysis to a metabelian group admitting integral polynomial exponents. - Anthony M. Gaglione; Seymour Lipschutz; Dennis Spellman (Groups Complex. Cryptol., 2015)

The structure of sidelobe-preserving operator groups. - Gregory Emmett Coxson; Dennis Spellman (IEEE Trans. Aerosp. Electron. Syst., 2015)

Orderable groups, elementary theory, and the Kaplansky conjecture. - Benjamin Fine; Anthony M. Gaglione; Gerhard Rosenberger; Dennis Spellman (Groups Complex. Cryptol., 2018)