Leonaitė, Gintarė, and Jonas Rimas. “Analytical Investigation of the Delay System With Structural Matrix Having Eigenvalues on the Unit Circle”. Lietuvos matematikos rinkinys 46, no. spec. (September 21, 2023): 371–375. Accessed May 15, 2024. https://www.journals.vu.lt/LMR/article/view/30760.