Abstract
By restricting the number of nondeterministic moves permitted during a real-time Turing machine computation, an infinite hierarchy can be exhibited between the real-time definable languages of Rosenberg and the quasi-real-time languages of Book and Greibach.
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Fischer, P.C., Kintala, C.M.R. Real-time computations with restricted nondeterminism. Math. Systems Theory 12, 219–231 (1978). https://doi.org/10.1007/BF01776575
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DOI: https://doi.org/10.1007/BF01776575