Unresolved Puzzles in the X-ray Emission Produced by Charge Exchange Measured on Electron Beam Ion Traps, article, August 1, 2012; (https://digital.library.unt.edu/ark:/67531/metadc841926/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .