Cross sections of K-shell ionization by electron impact, measured from threshold to 100 keV, for 'AU' and 'BI' - Fernandez-Varea, J. M.; Jahnke, Viktor; Malafronte, Alexandre Almeida; Maidana, Nora Lia; Vanin, Vito Roberto (JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 2014)