Four point conditions for symmetric TSP: The complete classification (bibtex)
by Vladimir G. Deineko, Bettina Klinz, Alexander Tiskin, Gerhard J. Woeginger
Reference:
Vladimir G. Deineko, Bettina Klinz, Alexander Tiskin, Gerhard J. Woeginger, Four point conditions for symmetric TSP: The complete classification, Discrete Optimization, 14, 147-159, (2014).
Bibtex Entry:
@article{klinz-4pt-tsp,
    author = {Vladimir G. Deineko and Bettina Klinz and Alexander Tiskin  and Gerhard J. Woeginger},
     title = {Four point conditions for symmetric {TSP}: {T}he complete classification},
   journal = {Discrete Optimization},
    volume = {14},
     pages = {147-159},
      year = 2014,
   MRCLASS = {90C27 (68Q25 90C60)},
  MRNUMBER = {3274328},
MRREVIEWER = {Hans-Ulrich Simon},
       DOI = {10.1016/j.disopt.2014.09.003},
       xxURL = {http://dx.doi.org/10.1016/j.disopt.2014.09.003},
}