Hiskes, J.R. & Karo, A. Formation processes and secondary emission coefficients for H/sup -/ production on alkali-coated surfaces, article, September 20, 1977; (https://digital.library.unt.edu/ark:/67531/metadc1074337/m1/1/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .