Mashkov, Petko, Edmunds Teirumnieks, Berkant Gyoch, Hristo Beloev, Tamara Pencheva, and Rostislav Kandilarov. “Design of LED Lamp With Special Spectral Characteristics”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 16, 2015): 147–152. Accessed May 5, 2024. https://journals.ru.lv/index.php/ETR/article/view/214.