W. Amenel Voglozin Guillaume Raschia Laurent Ughetto Noureddine Mouaddib Querying a summary of database. 59-73 2006 26 J. Intell. Inf. Syst. 1 http://dx.doi.org/10.1007/s10844-006-5451-1 db/journals/jiis/jiis26.html#VoglozinRUM06