Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Shigeru Kawasaki,The challenges of transportation/traffic statistics in Japan and directions for the future,IATSS Research,0386-1112,Elsevier BV,2015-07,39,1,1-8,https://cir.nii.ac.jp/crid/1362544420327995136,https://doi.org/10.1016/j.iatssr.2015.06.002