Map labeling and its generalizations
Srinivas Doddi,
Madhav V. Marathe,
Andranik Mirzaian,
Bernard M. E. Moret,
and Binhai Zhu
Proc. 8th Symp. Discrete Algorithms, ACM
and SIAM, Jan 1997, pp. 148–157
http://www.cs.unm.edu/~moret/map.ps
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