Universal Layered Permutations. - Michael H. Albert; Michael Engen; Jay Pantone; Vincent Vatter (Electron. J. Comb., 2018)

A Counterexample Regarding Labelled Well-Quasi-Ordering. - Robert Brignall; Michael Engen; Vincent Vatter (Graphs Comb., 2018)

On the dimension of downsets of integer partitions and compositions. - Michael Engen; Vincent Vatter (Australas. J Comb., 2019)

Stack-sorting, set partitions, and Lassalle's sequence. - Colin Defant; Michael Engen; Jordan A. Miller (J. Comb. Theory A, 2020)

Containing All Permutations. - Michael Engen; Vincent Vatter (Am. Math. Mon., 2021)