@TechReport{TonesD21,
  author =       {D. Calvanese and P. Dongilli and G. De Giacomo and A. Kaplunova and D. Lembo and M. Lenzerini and R. M{\"o}ller and R. Rosati and 
S. Tessaris and M. Wessel and I. Zorzi},
  title =        {{D21: Software Tools for Ontology Access,
Processing, and Usage}},
  institution =  {TONES},
  year =         2007,
  type           = {Project Deliverable},
  note	= {http://www.tonesproject.org}
}