Continuous Languages. - Thomas Ang; Janusz A. Brzozowski (AFL, 2008)

Languages Convex with Respect to Binary Relations, and Their Closure Properties. - Thomas Ang; Janusz A. Brzozowski (Acta Cybern., 2009)

Length of the Shortest Word in the Intersection of Regular Languages - Thomas Ang; Jeffrey O. Shallit (CoRR, 2009)

Automata and Reduced Words in the Free Group - Thomas Ang; Giovanni Pighizzini; Narad Rampersad; Jeffrey O. Shallit (CoRR, 2009)

Decidability and Shortest Strings in Formal Languages. - Levent Alpoge; Thomas Ang; Luke Schaeffer; Jeffrey O. Shallit (DCFS, 2011)