@phdthesis{oai:air.repo.nii.ac.jp:00003061,
 author = {Setiawan, Iwan and セティアワン, イワン},
 month = {Sep},
 school = {秋田大学},
 title = {Geology and REE Geochemistry of Granitoids and their Weathered Crusts at the Western Part of North Sumatra, Indonesia},
 year = {2017}
}