title: Introduction.
authors.affiliation: University of Rome La Sapienza, 00197 Rome, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Rega
authors.forename: Stefano
authors.initials: S
authors.lastname: Lenci
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D005246:Feedback; D007700:Kinetics; D017711:Nonlinear Dynamics; D013598:Systems Theory