@TechReport{BagnaraZGH01TRa, Author = "R. Bagnara and E. Zaffanella and R. Gori and P. M. Hill", Title = "Boolean Functions for Finite-Tree Dependencies", Number = 252, Type = "Quaderno", Institution = "Dipartimento di Matematica, Universit\`a di Parma, Italy", Year = 2001, Note = "Available at \url{http://www.cs.unipr.it/Publications/}", }