Prystavka Р. О. “The Density Distribution Function Renewal Process of Three Variables by Means of the Polynomial Spline Based on the B-Splines”. Proceedings of National Aviation University (archive) 17, no. 2 (June 24, 2003): 18–22. Accessed June 14, 2026. http://jrnl.kai.edu.ua/index.php/visnik/article/view/11904.