Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) KUNITAKA SHOJI,NON-REGULAR SEMIGROUPS WHICH ARE AMALGAMATION BASES,数理解析研究所講究録,18802818,[京都] : 京都大学数理解析研究所,2015-10,,1964,163-166,https://cir.nii.ac.jp/crid/1520572359989062144,