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• Doberkat, Ernst-Erich: Some remarks on the stability problem for linear space automata and semicontinuity of cut point languages. (English). Kybernetika, vol. 18 (1982), issue 2, pp. 89-105
• Pittl, Jan: Characterizations of stack uniform strict deterministic languages. (English). Kybernetika, vol. 17 (1981), issue 3, pp. 209-221