Penn, D.
, Clark, C.
, Powell, C.
, Fulop, T.
and Tanuma, S.
(1997),
Theory of the Cross Sections for Inelastic Scattering of Electrons by Core Level Excitations in Solids, Ultramicroscopy, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=620485 (Accessed May 21, 2026)