L.  Greco, Tocchini, F., and Innocenti, M., ?A Geometry-Based Algorithm for the Stability of Planar Switching Systems?, Int. J. of Systems Science, vol. 37, pp. 747?761, 2006. 

F.  Tocchini, Greco, L., and Innocenti, M., ?Stabilization of a Class of Planar Nonlinear Systems?, in 44th IEEE CDC-ECC'05, Seville, Spain, 2005. 

L.  Greco, Tocchini, F., and Innocenti, M., ?Stabilization of a Class of Unstable Switching Systems?, in 12th IEEE Mediterranean Conference, Kusadasi, Turkey, 2004. 

L.  Greco, Tocchini, F., and Innocenti, M., ?Necessary and Sufficient Conditions for Asymptotic Stability of Second Order LTI Switching Systems?. Dept. of Electrical Systems and Automation, University of Pisa, 2003.