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 "Kukkonen, Pertti",On the measurement of seasonal variations,,"Intitute for Economic Research, Bank of Finland",1963,Suomen Pankin taloustieteellisen tutkimuslaitoksen julkaisuja = Bank of Finland institute for economic research publications,,,,https://cir.nii.ac.jp/crid/1130282271201351040