title = {Fixed parameter algorithms for $(k,r)$-center in planar graphs and map graphs},
author = {Erik D. Demaine and Fedor V. Fomin and MohammadTaghi Hajiaghayi and Dimitrios M. Thilikos},
journal = {ACM Trans. Algorithms},
volume = {1},
number = {1},
pages = {33--47},
month = {Jul},
year = {2005}}

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