N. Y. Bobrenko, K. V. Kolezhuk, V. N. Komaschenko, G. I. Sheremetova, N. V. Yaroshenko, and A. S. Maystrenko, “UV radiation power meter in the UV-A, UV-B, UV-C ranges and their combinations”, TKEA, no. 6, pp. 34-35, Feb. 2006.