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Leung, Hing (2005). "Descriptional complexity of NFA of different ambiguity". International Journal of Foundations of Computer Science. 16 (5): 975–984. doi:10.1142/S0129054105003418. ISSN0129-0541.
Jirásek, Jozef; Jirásková, Galina; Šebej, Juraj (2016). "Operations on Unambiguous Finite Automata". Developments in Language Theory. Lecture Notes in Computer Science. Vol. 9840. pp. 243–255. doi:10.1007/978-3-662-53132-7_20. ISBN978-3-662-53131-0. ISSN0302-9743.
Leung, Hing (2005). "Descriptional complexity of NFA of different ambiguity". International Journal of Foundations of Computer Science. 16 (5): 975–984. doi:10.1142/S0129054105003418. ISSN0129-0541.
Jirásek, Jozef; Jirásková, Galina; Šebej, Juraj (2016). "Operations on Unambiguous Finite Automata". Developments in Language Theory. Lecture Notes in Computer Science. Vol. 9840. pp. 243–255. doi:10.1007/978-3-662-53132-7_20. ISBN978-3-662-53131-0. ISSN0302-9743.