Howard Straubing, Denis Thérien Regular Languages Defined by Generalized First-Order Formulas with a Bounded Number of Bound Variables. [Citation Graph (0, 0)][DBLP] Theory Comput. Syst., 2003, v:36, n:1, pp:29-69 [Journal]
Juha Honkala The Equivalence Problem of Polynomially Bounded D0L Systems - a Bound Depending Only on the Size of the Alphabet. [Citation Graph (0, 0)][DBLP] Theory Comput. Syst., 2003, v:36, n:1, pp:89-103 [Journal]
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