2024-03-29T02:35:53Z
https://oai.zbmath.org/v1/
oai:zbmath.org:3612460
0001-01-01T00:00:00
05
68
Pascu, Anca; Paun, Gheorghe
1979
3612460
English
Elsevier (North-Holland), Amsterdam
https://zbmath.org/03612460
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Discrete Math. 25, 195-197 (1979).
68Q45; 05C10; 05C15; 05C20
On the planarity of bicolored digraph grammar systems
j