@article{WassermannBudiOhrnbergeretal.1999,
  author    = {Joachim Wassermann and E. N. Budi and Matthias Ohrnberger and J. Gossler},
  title     = {Long term seismicity and source changes during different activity stages of Mt. Merapi (Indonesia) using a two scale seismic array},
  year      = {1999},
}