A factor-2 approximation for labeling points with maximum sliding labels
Z. P. Qin
and Binhai Zhu
Proc. 8th Scandinavian Worksh. Algorithm Theory (SWAT 2002), Lecture Notes in Computer Science 2368, Martti Penttonen
and Erik Meineche Schmidt, ed., Springer-Verlag, 2002, pp. 100–109
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