Quotient Complexity of Star-Free Languages. - Janusz A. Brzozowski; Bo Liu 092 (Int. J. Found. Comput. Sci., 2012)

On the State Complexity of the Shuffle of Regular Languages. - Janusz A. Brzozowski; Galina Jirásková; Bo Liu 092; Aayush Rajasekaran; Marek Szykula (DCFS, 2016)