@Article{Ayala1999, author="V. Ayala, L. San Martin ", title="Controllability of two-dimensional bilinear systems: restricted controls and discrete time ", journal="Proyecciones Journal of Mathematics ", year="1999", pages=" 207-223. ", volume="18" } @Book{Colonius2000, author="F. Colonius, W. Kliemann ", title="The Dynamics of Control", year="2000", publisher="Birkhäuser", address="Boston" } @Book{Elliott 2009, author="D. L. Elliott ", title="Bilinear Control Systems: Matrices in Action", year="2009", publisher="Springer", address="Dordrecht" } @Article{Sussmann1973, author="H. J. Sussmann", title="Orbits of families of vector fields and integrability of distributions ", journal="Trans. Amer. Math. Soc.", year="1973", pages="171-188. ", volume="180" }