@article{etna_vol43_pp90-99, author = {Nicolai D. Christov and Mihail M. Konstantinov and Petko Hr. Petkov}, title = {Improved perturbation bounds for the continuous-time $H_{\infty}$-control problem}, journal = {Electron. Trans. Numer. Anal.}, volume = {43}, year = {2014-2015}, pages = {90--99}, }