1. Gelig, A.Kh. and Zuber, I.E., Using the Direct and Indirect Control to Stabilize Some Classes of Uncertain Systems. I. Continuous Systems, Autom. Remote Control, 2012, vol. 73, no 8, pp. 1337–1349.
2. Andeen, R.E., The Principle of Equivalent Areas, Trans. AIEE (Application and Industry), 1960, no. 79, pp. 332–336.
3. Gelig, A.Kh. and Churilov, A.N., Kolebaniya i ustoichivost’ nelineinykh impul’snykh sistem (Oscillations and Stability of the Nonlinear Pulse Systems), St. Petersburg: S.-Peterburg. Univ., 1993.
4. Gelig, A.Kh. and Churilov, A.N., Stability and Oscillations of Nonlinear Pulse-Modulated Systems, Boston: Birkhäuser, 1998.
5. Gelig, A.Kh, Zuber, I.E., and Churilov, A.N., Ustoichivost’ i stabilizatsiya nelineinykh sistem (Stability and Stabilization of Nonlinear Systems), St. Petersburg: S.-Peterburg. Univ., 2006.