Korolyuk, V. S. “Stochastic Systems With Averaging in the Scheme of Diffusion Approximation”. Ukrains’kyi Matematychnyi Zhurnal 57, no. 9 (September 25, 2005): 1235–1252. Accessed May 4, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3681.