Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yoshihiro Watanabe and Osamu Matsuoka,Four-component relativistic configuration-interaction calculation using the reduced frozen-core approximation,The Journal of Chemical Physics,0021-9606,AIP Publishing,2002-06-08,116,22,9585-9590,https://cir.nii.ac.jp/crid/1361418521121165056,https://doi.org/10.1063/1.1476694