@INPROCEEDINGS{bpr11B,
  author = {M. Benedikt and G. Puppis and C. Riveros},
  title = {The Cost of Traveling Between Languages},
  booktitle = {Proceedings of the 38th International Colloquium on Automata, Languages and Programming (ICALP)},
  year = {2011},
  pages = {234-245},
  series = {LNCS},
  volume = {6756},
  publisher = {Springer}
}