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Han Yo-Sub; Salomaa Arto; Salomaa Kai: Ambiguity, nondeterminism and state complexity of finite automata. In: Acta cybernetica, (23) 1. pp. 141-157. (2017)
Han Yo-Sub; Ko Sang-Ki; Piao Xiaoxue; Salomaa Kai: State complexity of Kleene-star operations on regulat tree languages. In: Acta cybernetica, (22) 2. pp. 403-422. (2015)
Salomaa Kai; Yu Sheng: Generalized fairness and context-free languages. In: Acta cybernetica, (14) 1. pp. 193-203. (1999)
Salomaa Kai: Alternation bounds for tree automata. In: Acta cybernetica, (10) 3. pp. 173-197. (1992)