On symmetry in strings, sequences and languages

Solomon Marcus Faculty of Mathematics, University of Bucharest, Str. Academiei 14, Bucuresti, 70109, Romania

Alexandru Mateescu Faculty of Mathematics, University of Bucharest, Str. Academiei 14, Bucuresti, 70109, Romania

Gheorghe Păun Institute of Mathematics of the Romanian Academy of Sciences, PO Box 1-764, Bucuresti, 70700, Romania

Arto Salomaa Department of Mathematics, Academy of Finland and University of Turku, Turku, SF, 20500, Finland

References

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