Model Reduction of MIMO Systems via Tangential Interpolation. - Kyle A. Gallivan; Antoine Vandendorpe; Paul Van Dooren (SIAM J. Matrix Anal. Appl., 2004)

Model reduction via projection of generalized state space systems. - Antoine Vandendorpe; Paul Van Dooren (CDC/ECC, 2005)

On the embedding of state space realizations. - Yves V. Genin; Antoine Vandendorpe (Math. Control. Signals Syst., 2007)