Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
TSE P,The mineral industry of North Korea. In : Area reports-International-Asia and the Pacific,US Geological Survey Mineral Yearbook 2001,,,2002,0,,14.1-14.2,https://cir.nii.ac.jp/crid/1570291225353503232,