Apparatus for shifting the wavelength of light. [US patent application]
Apparatus for shifting the wavelength of light. [US patent application], patent, January 29, 1982; [Washington D.C.]. (https://digital.library.unt.edu/ark:/67531/metadc1186633/: accessed October 19, 2021), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.