Hunter, Richard Sewall. Photoelectric Color-Difference Meter. JOSA. July 1948, 38 (7): 661 [2021-01-15]. (原始内容存档于2019-12-12). (Proceedings of the Winter Meeting of the Optical Society of America)
Hunter, Richard Sewall. Photoelectric Color-Difference Meter. JOSA. July 1948, 38 (7): 661 [2021-01-15]. (原始内容存档于2019-12-12). (Proceedings of the Winter Meeting of the Optical Society of America)