@InProceedings{mg11Grave,
  author = {Grave, F. and Frutos-Alfaro, F. and  Müller, T and Adis, D.},
  title  = {{Wave Fronts in General Relativity Theory}},
  year   = {2008},
  pages  = {1737-1739},
  booktitle = {{Proceedings of the Eleventh Marcel Grossmann Meeting on General Relativity}}
}