1. On the equivalence and rewriting of aggregate queries

   • Stéphane Grumbach
   • Maurizio Rafanelli
   • Leonardo Tininini

   OriginalPaper Pages: 529 - 584

2. Exhaustive generation of combinatorial objects by ECO

   • Silvia Bacchelli
   • Elena Barcucci
   • Elisa Pergola

   OriginalPaper Pages: 585 - 602

3. On the complexity of drawing trees nicely: corrigendum

   • Thorsten Akkerman
   • Christoph Buchheim
   • Daniel Teske

   OriginalPaper Pages: 603 - 607