Radio Labeling with Preassigned Frequencies. Bodlaender, H. L., Broersma, H., Fomin, F. V., Pyatkin, A. V., & Woeginger, G. J. SIAM Journal on Optimization, 15(1):1-16, 2004.
Radio Labeling with Preassigned Frequencies. [link]Link  Radio Labeling with Preassigned Frequencies. [link]Paper  bibtex   
@article{journals/siamjo/BodlaenderBFPW04,
  author = {Bodlaender, Hans L. and Broersma, Hajo and Fomin, Fedor V. and Pyatkin, Artem V. and Woeginger, Gerhard J.},
  date = {2010-06-28},
  ee = {http://dx.doi.org/10.1137/S1052623402410181},
  interhash = {fb42f426ac9c82b66f49761459d40ed5},
  intrahash = {2343af214feb40122ae5f1e2b62904ec},
  journal = {SIAM Journal on Optimization},
  number = 1,
  pages = {1-16},
  title = {Radio Labeling with Preassigned Frequencies.},
  url = {http://dblp.uni-trier.de/db/journals/siamjo/siamjo15.html#BodlaenderBFPW04},
  volume = 15,
  year = 2004
}

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