A.  Chaillet, Chitour, Y., Lor, A., and Sigalotti, M., ?Towards uniform linear time-invariant stabilization of systems with persistency of excitation?, Submitted to CDC 2007. New Orleans, USA, 2007. 

A.  Chaillet, Chitour, Y., Lor, A., and Sigalotti, M., ?Uniform stabilization for linear systems with persistency of excitation. The neutrally stable and the double integrator cases?, Submitted to Mathematics of Control, Signals and Systems. 2007.