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"k-L(2, 1)-labelling for planar graphs is NP-complete for k>=4."
Nicole Eggemann, Frédéric Havet, Steven D. Noble (2010)
- Nicole Eggemann, Frédéric Havet, Steven D. Noble:
k-L(2, 1)-labelling for planar graphs is NP-complete for k>=4. Discret. Appl. Math. 158(16): 1777-1788 (2010)
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