Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) 伊藤 桂,Restriction of Yukawa Couplings in 4-Family Orbifold Model,Soryushiron Kenkyu Electronics,03711838,Soryushiron Kenkyu Editorial Office,1987,75,6,114-120,https://cir.nii.ac.jp/crid/1390001204075093760,https://doi.org/10.24532/soken.75.6_114