Comparison of photoelectron-spectroscopy results to ab-initio and density functional calculations : the ethylbenzene cationLehrer, F.; Weinkauf, R.; Metsala, AndrusZeitschrift für physicalische Chemie2007 / 5, p. 723-749https://www.degruyter.com/document/doi/10.1524/zpch.2007.221.5.723/html