Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Nagao Toru and Shibata Yoshitaka and Akuta Kouichi,Constitution of Railway map and topological mapping (TECHNICAL SESSION CONTENTS),PROCEEDINGS OF THE ANNUAL CONFERENCE OF JSSD,,Japanese Society for the Science of Design,2001,48,0,116-117,https://cir.nii.ac.jp/crid/1390001205610425984,https://doi.org/10.11247/jssd.48.0_116