@INPROCEEDINGS{ccp11,
  author = {O. Carton and T. Colcombet and G. Puppis},
  title = {Regular Languages of Words Over Countable Linear Orderings},
  booktitle = {Proceedings of the 38th International Colloquium on Automata, Languages and Programming (ICALP)},
  year = {2011},
  pages = {125-136},
  series = {LNCS},
  volume = {6756},
  publisher = {Springer}
}