Derivative polynomials, Euler polynomials, and associated integer sequences. Hoffman, Michael — 1999 The Electronic Journal of Combinatorics [electronic only]
An analogue of covering space theory for ranked posets. Hoffman, Michael E. — 2001 The Electronic Journal of Combinatorics [electronic only]
A character on the quasi-symmetric functions coming from multiple zeta values. Hoffman, Michael E. — 2008 The Electronic Journal of Combinatorics [electronic only]