@article{OhrnbergerWassermannScherbaumetal.1999,
  author    = {Ohrnberger, Matthias and Wassermann, J{\"u}rgen and Scherbaum, Frank and Budi, E. N. and Gossler, J.},
  title     = {Detection and classification of seismic signals of volcanic origin at Mt. Merapi (Indonesia)},
  year      = {1999},
  language  = {en}
}
@article{WassermannBudiOhrnbergeretal.1999,
  author    = {Wassermann, Joachim and Budi, E. N. and Ohrnberger, Matthias and Gossler, J.},
  title     = {Long term seismicity and source changes during different activity stages of Mt. Merapi (Indonesia) using a two scale seismic array},
  year      = {1999},
  language  = {en}
}