Куц, Ю.В., and Л.М. Щербак. “The Correlation Analysis of the Cyclic Casual Process Phase Characteristics”. Proceedings of National Aviation University (archive) 26, no. 4 (April 1, 2005): 13–17. Accessed February 4, 2026. https://jrnl.nau.edu.ua/index.php/visnik/article/view/1240.