1. Bourne, H.K.: Discharge lamps for photography and projection, (Chapman & Hall, London 1948),90–91, 132–133,
2. Steinmetz, C.P.: (No. 1,025,932)(appl. 1902, issued 1912)
3. Waymouth, J.F.: Electric discharge lamps, (MA:MIT Press, Cambridge 1971),chaps. 8–11,
4. Elenbaas, W.: Light sources, (Macmillan, London 1972),chap. 8,
5. Beeson, E.J.G.: ‘Metal halide, xenon, and neon lamps’, Henderson, S.T., Marsden, A.M., Lamps and lighting, London 1972),chap. 15, Arnold