Kroics, Kaspars. “UNIDIRECTIONAL BRAKING ENERGY RECOVERY SYSTEM FOR ELEVATORS”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June 20, 2019): 124–128. Accessed April 6, 2025. https://journals23.rta.lv/index.php/ETR/article/view/4173.