1. R. Bagnara, Data-flow analysis for constraint logic-based languages, Ph.D. Thesis, Dipartimento di Informatica, Università di Pisa, Pisa, Italy, printed as Report TD-1/97, March 1997
2. Precise widening operators for convex polyhedra;Bagnara,2003
3. Widening operators for powerset domains;Bagnara,2003
4. Possibly not closed convex polyhedra and the Parma Polyhedra Library;Bagnara,2002