Numerical Methods for Robust Control. - Petko Hr. Petkov; A. S. Yonchev; Nikolai D. Christov; Michail M. Konstantinov (LSSC, 2007)

On the Local Sensitivity of the Discrete-Time Control Problem. - A. S. Yonchev; Petko Hr. Petkov; Nikolai D. Christov; Michail M. Konstantinov (NAA, 2008)