The Frobenius Problem in a Free Monoid. - Jui-Yi Kao; Jeffrey O. Shallit; Zhi Xu 002 (STACS, 2008)

On NFAs Where All States are Final, Initial, or Both - Jui-Yi Kao; Andrew J. Malton; Narad Rampersad; Jeffrey O. Shallit (CoRR, 2008)

Words avoiding repetitions in arithmetic progressions. - Jui-Yi Kao; Narad Rampersad; Jeffrey O. Shallit; Manuel Silva 003 (Theor. Comput. Sci., 2008)

On NFAs where all states are final, initial, or both. - Jui-Yi Kao; Narad Rampersad; Jeffrey O. Shallit (Theor. Comput. Sci., 2009)