Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Kichisuke Nishimoto and Kimiko Nakatsukasa and Ryoichi Fujishiro and Shunji Kato,SCF MO calculations of heteroatomic systems with the variable ? approximation,Theoretica Chimica Acta,0040-5744,Springer Science and Business Media LLC,1969,14,1,80-90,https://cir.nii.ac.jp/crid/1363670320942550016,https://doi.org/10.1007/bf00527331