Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yasuyuki Ishikawa,"Relativistic Dirac-Fock and many-body perturbation calculations on He, He-like ions, Ne, and Ar",Physical Review A,1050-2947,American Physical Society (APS),1990-08-01,42,3,1142-1150,https://cir.nii.ac.jp/crid/1363388845142151296,https://doi.org/10.1103/physreva.42.1142