Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SAGAN Amih and NAGAOKA Shin-ich and TERAMAE Hiroyuki and NAGASHIMA Umpei,Molecular Orbital Energy Level Diagrams of HeH+,"Journal of Computer Chemistry, Japan",1347-1767,"Society of Computer Chemistry, Japan",2011,10,4,147-151,https://cir.nii.ac.jp/crid/1390282680158024576,https://doi.org/10.2477/jccj.2011-0008