Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) HAYAKAWA EIJIROU,PERIODIC MOTION OF PUNCTURES ON DISKS,Scientiae Mathematicae japonicae,13460862,,2005-05-01,61,3,481-492,https://cir.nii.ac.jp/crid/1571980075417798528,