Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Hirota Ryogo,Integrability of soliton equations : from discrete to ultradiscrete (Progress in Mathematics of Integrable Systems),RIMS Kokyuroku Bessatsu,18816193,Kyoto University,2012-04,30,,1-23,https://cir.nii.ac.jp/crid/1571135652846389632,