@article{DBLP:journals/dam/GutinK10,
  author    = {Gregory Gutin and
               Eun Jung Kim},
  title     = {The complexity of the minimum cost homomorphism problem
               for semicomplete digraphs with possible loops},
  journal   = {Discrete Applied Mathematics},
  volume    = {158},
  number    = {4},
  year      = {2010},
  pages     = {319-330},
  ee        = {http://dx.doi.org/10.1016/j.dam.2009.07.013},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}