Mishura, Yu. S., and Ya. O. Oltsik. “Optimal Stopping Times for Solutions of Nonlinear Stochastic Differential Equations and Their Application to One Problem of Financial Mathematics”. Ukrains’kyi Matematychnyi Zhurnal 51, no. 6 (June 25, 1999): 804–809. Accessed May 12, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4667.