Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) HARA Toshihiko,Tempo and Quantum : Comparison between Ryder Index and a Simple Method,The Journal of Population Studies,03868311,Population Association of Japan,2005,37,0,47-65,https://cir.nii.ac.jp/crid/1390282679621628672,https://doi.org/10.24454/jps.37.0_47