Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) PARK Jinkyung and KIM Sungsoo,"VERTICAL RELATIONSHIP, EFFICIENCY AND PRODUCTIVITY IN THE KOREAN AND JAPANESE RAILWAY INDUSTRIES:",Journal of the Eastern Asia Society for Transportation Studies,1881-1124,Eastern Asia Society for Transportation Studies,2007,7,0,315-327,https://cir.nii.ac.jp/crid/1390282680267606528,https://doi.org/10.11175/easts.7.315