Villareal, E.R.L, J.A. Ruiz Vargas, and E.M. Hemerly. 2009. “Static Output Feedback Stabilization Using Invariant Subspaces and Sylvester Equations”. Trends in Computational and Applied Mathematics 10 (1):99-110. https://doi.org/10.5540/tema.2009.010.01.0099.