@inproceedings{BKMS10,
  author    = {Hans-Joachim B{\"o}ckenhauer and Ralf Klasing and
               Tobias M{\"o}mke and Monika Steinov{\'a}},
  title     = {Improved Approximations for TSP with Simple Precedence Constraints},
  booktitle = {Algorithms and Complexity, 7th International Conference,
               CIAC 2010}
  location  = {Rome, Italy}
  year      = {2010},
  pages     = {61--72},
  doi       = {http://dx.doi.org/10.1007/978-3-642-13073-1_7},
  bibsource = {DBLP, http://dblp.uni-trier.de}
  publisher = {Springer},
  isbn      = {978-3-642-13072-4},
}