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Jürgensen, Helmut and Kari, Lila and Kopecki, Steffen: Methods for relativizing properties of codes. In: Acta cybernetica, (22) 2. pp. 259-292. (2015)
Kari, Lila and Rozenberg, Grzegorz and Salomaa, Arto: Generalized DOL trees. In: Acta cybernetica, (12) 1. pp. 1-9. (1995)