1. A. I. Lur’e. Some Nonlinear Problems in the Theory of Automatic Control. London: H. M. Stationery, 1957.
2. V. M. Popov. Absolute stability of nonlinear systems of automatic control. Automation and Remote Control, 22(8): 857–875, 1962.
3. K. S. Narendra and J. H. Taylor. Frequency Domain Criteria for Absolute Stability. New York: Academic Press, 1973.
4. A. R. Gaiduk. Absolute stability of control systems with several nonlinearities. Automation and Remote Control, 37, 815–821, 1976.
5. P. Park. A revisited Popov criterion for nonlinear Lurie systems with sectorrestrictions. International Journal of Control, 68(3): 461–470, 1997.