“Singularly Perturbed Markov Models of Recovery Processes of Human–Machine–Environmental Systems With a Protection Subsystem”. Visnyk of Vinnytsia Politechnical Institute, no. 4 (September 30, 2026): 108–118. Accessed November 15, 2026. https://vpi.sprava.net/index.php/visnyk/article/view/3576.