@article{DeBecker:1570,
      author        = "De Becker, Martine and Camelbeeck, Thierry and Poitevin,
                       Christian",
      title         = "{Clustering of seismicity in the regions of Brabant and
                       Ardennes Massives before the Liège earthquake of November
                       8, 1983}",
      year          = "1985",
}