Multitape one-way nonwriting automataPatrick C. FischerArnold L. Rosenberg1968Journal of Computer and System Sciences
Characterizing derivation trees of context-free grammars through a generalization of finite automata theoryJ.W. Thatcher1967Journal of Computer and System Sciences
Multitape finite automata with rewind instructionsArnold L. Rosenberg1967Journal of Computer and System Sciences