Gasanenko, V. A. “On Certain Exact Relations for Sojourn Probabilities of a Wiener Process”. Ukrains’kyi Matematychnyi Zhurnal 51, no. 6 (June 25, 1999): 842–846. Accessed May 11, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4671.