1. V. N. Zhuk, in:Healthy Light (Phototherapy) [in Russian], St. Petersburg (1909), p. 911.
2. B. S. Kogan,Effect of White (Electric) Light and Rays of Different Colors on Nitrogenous Metamorphosis in Animals [in Russian], St. Petersburg (1894).
3. A. Kondrat’ev,Some Experiments on the Effect of Different Illumination on the Course of Artificial Putrefactive Infection in Animals [in Russian], St. Petersburg (1880).
4. N. Finzen,Phototherapy [in Russian], St. Petersburg (1901).
5. S. Bech-Thomsen, N. Wulf, and H. Poulsen,Arch. Dermatol.,124, 1215–1218 (1987).