Geodesic
Two infinite hierarchies of languages defined by branching grammars
Kybernetika, Tome 14 (1978) no. 6, pp. 397-407

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Classification : 68F05, 68Q45 
Păun, Gheorghe. Two infinite hierarchies of languages defined by branching grammars. Kybernetika, Tome 14 (1978) no. 6, pp. 397-407. http://geodesic.mathdoc.fr/item/KYB_1978_14_6_a1/
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