Two-photon physics, article, October 1, 1981; (https://digital.library.unt.edu/ark:/67531/metadc1055419/m1/1/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .
Two-photon physics, article, October 1, 1981; (https://digital.library.unt.edu/ark:/67531/metadc1055419/m1/1/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .