著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL "Ark, Bart van",Economic growth and labour productivity in Europe : half a century of East-West comparisons,,Groningen Growth and Development Centre,1999,Research memorandum,,,,https://cir.nii.ac.jp/crid/1130000797502795776