1. Austinat, H., Diekert, V., Hertrampf, U., Petersen, H.: Regular frequency computations. In: Proceedings of the RIMS Symposium on Algebraic Systems, Formal Languages and Computation, pp. 35–42, Kyoto, Japan, 2000
2. Austinat, H., Diekert, V., Hertrampf, U.: A structural property of regular frequency computations. Theor. Comput. Sci. 292(1), 33–43 (2003)
3. Beigel, R., Gasarch, W.I., Kinber, E.B.: Frequency computation and bounded queries. Theor. Comput. Sci. 163(1–2), 177–192 (1996)
4. Degtev, A.N.: On (m,n)-computable sets. In: Algebraic Systems, pp. 88–99 (1981) (in Russian)
5. Harizanov, V.S., Kummer, M., Owings, J.C.: Frequency computations and the cardinality theorem. J. Symb. Log. 57(2), 682–687 (1992)