Steišūnas, S. “On the Sojourn Time of the Brownian Process in a Multidimensional Sphere”. Nonlinear Analysis: Modelling and Control 14, no. 3 (July 20, 2009): 389–396. Accessed May 4, 2025. https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/14502.