@inCollection{Amati&99:LUMIS,
   author    =    {Amati, Gianni and Bruza, Peter},
   title     =     {A logical approach to query reformulation motivated from
                       belief change},
   booktitle = {Workshop on logical and uncertainty models for 
    Information Systems},
   address = {University College London (UCL), London, England },
   year      =      {1999},
   url = {http://www.dcs.gla.ac.uk/lumis99/programme-40.html},
}