Kumarswamy, S., and R. Subramanian. “O Pewnym Stochastycznym Modelu Dla Problemu Uderzenia”.
Engineering Transactions
19, no. 1 (March 30, 1971): 85–95. Accessed July 11, 2025.
https://et.ippt.pan.pl/index.php/et/article/view/2532
.