Kanchanaharuthai, A. . “Immersion and Invariance-Based Nonlinear Controller for a Power System With the Excitation and STATCOM”. Journal of Current Science and Technology, vol. 2, no. 2, Feb. 2023, pp. 151-60, https://ph04.tci-thaijo.org/index.php/JCST/article/view/583.