Doraci, Koçi, Leonard Çomeni, and Erjon Selmani. “Determining the Moral Depreciation Function of Railway Vehicles in Market Economy Conditions: A Review”. Interdisciplinary Journal of Research and Development 9, no. 4. S2 (December 20, 2022): 63. Accessed April 2, 2025. https://www.journal-uamd.org/index.php/IJRD/article/view/196.