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Cooper, J. and Clark, C. and Cromer, C. and Lucatorto, T. and Sonntag, B. and Kennedy, Eugene T. and Costello, John T. (1989) Marked differences in the 3p photoabsorption between the Cr and Mn⁺ isoelectronic pair: reasons for the unique structure observed in Cr. Physical Review A, 39 (11). pp. 6074-6077. ISSN 0556-2791