Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Okumura Yoshitaka,Two Higgs Doublet Model in a Noncommutative Geometry on the Discrete Space M4 * Z4.,Progress of Theoretical Physics,0033068X,THE PHYSICAL SOCIETY OF JAPAN,1997,97,3,491-506,https://cir.nii.ac.jp/crid/1390282679132685440,https://doi.org/10.1143/ptp.97.491