Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Kouichi Takeshita and Yosiki Sadamatu and Kiyoshi Tanaka,A theoretical study on the inner-valence photoelectron spectra lying between 21 and 26 eV of the O2 molecule,The Journal of Chemical Physics,0021-9606,AIP Publishing,2005-01-04,122,4,,https://cir.nii.ac.jp/crid/1363951795781085440,https://doi.org/10.1063/1.1834565