Pracht, Friedhelm. “Waterproof Luminaire Made of Synthetic Material With High Performance Reflectors and Ignition System for tri‐phosporus Lamps Used at Very Low Temperatures”. Technological and Economic Development of Economy 11, no. 2 (June 30, 2005): 108-114. Accessed November 28, 2024. https://ijspm.vgtu.lt/index.php/TEDE/article/view/8506.