1. G. Basile and G. Marro, "L'invarianze respetto al disturbi studiante nello spatio deli stati," Proc. 70th Ann. Meeting Elec. Eng. Assoc, Italy (1969) Paper 1.4.0.1.
2. G. Basile and G. Marro, "Controlled and conditioned invariant subspaces in linear system theory" J. Opt. Theory and Appl. 3(1969) 306–315.
3. C.I. Byrnes, "Quotients for Equivalence Relations and Topological invariants of Foliations" (to appear).
4. C.I. Byrnes and A.J. Krener, "Global Methods for Nonlinear Geometric Control Theory, I" (to appear).
5. C.I. Byrnes, A. Isidori, and A.J. Krener, "Global Methods for Nonlinear Geometric Control Theory, II — Applications to Singular {f,g}-invariant Distributions", (to appear).