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"Labeling trees with a condition at distance two."
Tiziana Calamoneri, Andrzej Pelc, Rossella Petreschi (2006)
- Tiziana Calamoneri
, Andrzej Pelc, Rossella Petreschi:
Labeling trees with a condition at distance two. Discret. Math. 306(14): 1534-1539 (2006)
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