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"L(2, 1)-labellings of integer distance graphs."
Peter Che Bor Lam, Tao-Ming Wang, Guohua Gu (2008)
- Peter Che Bor Lam, Tao-Ming Wang, Guohua Gu:
L(2, 1)-labellings of integer distance graphs. IWOCA 2008: 166-172
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