Rosa, V., and Ya. M. Chabanyuk. 2018. “Procedure of Stochastic Approximation for the Diffusion Process with semi-Markov Switchings”. Ukrains’kyi Matematychnyi Zhurnal 70 (11), 1563-70. https://umj.imath.kiev.ua/index.php/umj/article/view/1660.