Advances in DC photocathode electron guns, article, July 1, 1998; (https://digital.library.unt.edu/ark:/67531/metadc703754/m1/3/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .
Advances in DC photocathode electron guns, article, July 1, 1998; (https://digital.library.unt.edu/ark:/67531/metadc703754/m1/3/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .