Lamm، Uno (1964). "Mercury-arc valves for high-voltage d.c. transmission". Proceedings of the Institution of Electrical Engineers. Institution of Engineering and Technology (IET). ج. 111 ع. 10: 1747. DOI:10.1049/piee.1964.0286. ISSN:0020-3270.
Lamm، Uno (1964). "Mercury-arc valves for high-voltage d.c. transmission". Proceedings of the Institution of Electrical Engineers. Institution of Engineering and Technology (IET). ج. 111 ع. 10: 1747. DOI:10.1049/piee.1964.0286. ISSN:0020-3270.