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NIST X-ray Photoelectron Spectroscopy Database (SRD 20), Version 5.0
Nefedov V.I., Schubochkina E.F., Kolomnikov I.S., Baranovskii I.B., Kukolev V.P., Golubnichaya M.A., Schubochkin L.K., Porai-Koshits, M. A., Volp'in, M. E.