Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yasunori Yoshioka and Shigehiro Kubo and Shinji Kiribayasi,Hubbard and Heisenberg Models for Four-Site Four-Electron Systems.Group-Theoretical Interrelationships and Applications to Multinuclear Transition-Metal Clusters,Bulletin of the Chemical Society of Japan,00092673,Tokyo : Chemical Society of Japan,1998-03,71,3,573-588,https://cir.nii.ac.jp/crid/1524232505711547904,