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"L(2, 1, 1)-Labeling Is NP-Complete for Trees."
Petr A. Golovach, Bernard Lidický, Daniël Paulusma (2010)
- Petr A. Golovach
, Bernard Lidický
, Daniël Paulusma
:
L(2, 1, 1)-Labeling Is NP-Complete for Trees. TAMC 2010: 211-221
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