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[1]
TIME AND TAPE COMPLEXITY OF PUSHDOWN AUTOMATON LANGUAGES
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[2]
COBHAM A, 1964, 1964 P INT C LOG MET, P24
[3]
COLE SN, 1966, 7 ANN S SWITCH AUT T, P53
[4]
COOK SA, 1969, MAY C REC ACM S THEO