On covering problems of codes. Frances, M. & Litman, A. 30(2):113–119, 1997.
doi  bibtex   
@Article{frances97covering,
  author    = {Moti Frances and Ami Litman},
  title     = {On covering problems of codes},
  journal   = TCSyst,
  year      = {1997},
  volume    = {30},
  number    = {2},
  pages     = {113--119},
  comment   = {center string problem is NP complete},
  doi       = {10.1007/BF02679443},
  owner     = {Sebastian},
  timestamp = {2009.03.13},
}

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