Milchev, Galin, and Radoslav Miltchev. “Development of Information Technologies, Planned Obsolescence and Modification of the Life-Cycle of the CAD/CAM/CAE Systems”. European Journal of Sustainable Development 7, no. 3 (October 1, 2018): 217. Accessed November 22, 2024. https://ojs.ecsdev.org/index.php/ejsd/article/view/701.