Fixed-parameter algorithms for the $(k,r)$-center in planar graphs and map graphs
Erik D. Demaine,
Fedor V. Fomin,
MohammadTaghi Hajiaghayi,
and Dimitrios M. Thilikos
Proc. 30th Int. Coll. Automata, Languages and Programming (ICALP 2003), Lecture Notes in Computer Science 2719, Jos C. M. Baeten,
Jan Karel Lenstra,
Joachim Parrow,
and Gerhard J. Woeginger, ed., Springer-Verlag, 2003, pp. 829–844
Tech. report, Univ. of Bergen, Dept. of Informatics, Apr 2003
http://www.lsi.upc.es/~sedthilk/papers/mapgraph.pdf
http://www.ii.uib.no/publikasjoner/texrap/ps/2003-245.ps
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