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  1. By: Takagi, Masaoki - Ueta, Mutsuyuki. 植田, 睦之, - Ikeda, S
    Type: Article
    In: The journal of raptor research
    Volume: 29
    Issue: 4
    Date: 1995
    Page Range: 267--269
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Iijima, Isao, - Ikeda, S
    Type: Article
    In: The journal of the College of Science, Imperial University, Japan = Teikoku Daigaku kiyō. Rika
    Volume: 8
    Date: 1895
    Page Range: 323--337
    Publication Info: Tōkyō, Japan, The University, 1887-1897