Yezhov, I. I., and V. F. Kadankov. 1998. “On the Distribution of the Maximum of the Difference of Independent Renewal Processes With Discrete Time”. Ukrains’kyi Matematychnyi Zhurnal 50 (10), 1426–1432. https://umj.imath.kiev.ua/index.php/umj/article/view/4829.