@article{MertinsOppeneerValenciaetal.2004,
  author    = {H.-Ch. Mertins and P. M. Oppeneer and S. Valencia and W. Gudat and F. Senf and P. R. Bressler},
  title     = {X--Ray Natutral Birefringence in Reflection From Graphite},
  journal   = {Physical Review B},
  volume    = {70},
  pages     = {235106 -- 1 - 8},
  year      = {2004},
}