@article{Oncescu:1561,
      author        = "Oncescu, M.C. and Camelbeeck, Thierry and Martin, Henri",
      title         = "{Source parameters for the Roermond aftershocks of April
                       13 - May 2, 1992 and site spectra for P and S waves at the
                       Belgian seismic network}",
      year          = "1994",
}