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"An infinite hierarchy of tree transformations in the class NDR."
Sándor Vágvölgyi, Zoltán Fülöp (1987)
- Sándor Vágvölgyi, Zoltán Fülöp:
An infinite hierarchy of tree transformations in the class NDR. Acta Cybern. 8(2): 153-168 (1987)
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