Journal of Automata, Languages and Combinatorics formerly:
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@article{jalc070302, author = {Cezar C\^ampeanu and Kai Salomaa and Sheng Yu}, title = {Tight Lower Bound for the State Complexity of Shuffle of Regular Languages}, journal = jalc, year = 2002, volume = 7, number = 3, pages = {303--310} }