Pospíšil, Michal. “Representation of Solutions of Systems of Linear Differential Equations With Multiple Delays and Nonpermutable Variable Coefficients”. Mathematical Modelling and Analysis 25, no. 2 (March 18, 2020): 303-322. Accessed November 13, 2024. https://btp.vgtu.lt/index.php/MMA/article/view/11194.