Korolyuk, V. S., and N. Limnios. “Diffusion Approximation With Equilibrium for Evolutionary Systems Switched by Semi-Markov Processes”. Ukrains’kyi Matematychnyi Zhurnal 57, no. 9 (September 25, 2005): 1253–1260. Accessed May 11, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3682.