Miroshnychenko Sergii, Tkachenko Igor, and Miroshnychenko Yuryi. “About Two Types of Nonstationary Stochastic Processes”. International Journal of Formal Sciences: Current and Future Research Trends 21, no. 1 (June 20, 2024): 48–53. Accessed September 21, 2025. https://ijfscfrtjournal.isrra.org/Formal_Sciences_Journal/article/view/1032.