1. Ho, M., Datta, A., and Bhattacharyya, S., A Linear Programming Characterization of all Stabilizing PID Controllers, in Proc. Am. Control Conf., 1997, Albuquerque, pp. 3922–3928.
2. Ackermann, J. and Kaesbauer, D., Stable Polyhedra in Parameter Space, Automatica, 2003, vol. 39, pp. 937–943.
3. Cook, R.P., Gain and Phase Boundary Routine for Two-Loop Feedback Systems, IEEE Trans. Automat. Control, 1966, vol. 11, no. 3, pp. 573–577.
4. Chang, C.H. and Han, K.W., Gain Margins and Phase Margins for Control Systems with Adjustable Parameters, J. Guidance Control Dynamics, 1990, vol. 13, no. 13, pp. 404–408.
5. Bimbirekov, B.L., Frequency Criteria-based Determination of the Controller Parameters for the Linear System, Avtom. Telemekh., 1993, no. 5, pp. 3–10.