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
"Wallenquist, Åke",A study of the variation of the space density in the direction of southern galactic clusters on the basis of a spectral investigation of white stars,,A.C. Nix,1931,Annalen v.d. Bosscha-Sterrenwacht,,,,https://cir.nii.ac.jp/crid/1130282270486901888