1. Control system design via the second method of Lyapunov;Kalman;Trans. ASME, J. bas. Engng Series D,1960
2. Control engineering applications of V. I. Zubov's construction procedure for Lyapunov functions;Margolis;IEEE Trans. Aut. Control,1963
3. Problems in the theory of the second method of Lyapunov construction of the general solution in the domain of asymptotic stability;Zubov;Prikl. Mat. Mekh.,1955
4. Stability boundary approximations for relay-control systems via a steepest-ascent construction of Lyapunov functions;Weissenberger;JACC 1965,1965