1. 1) Yoshihiro Shigemori : “Color and Color Development”, p.71, Nikkan Kogyo Shinbun Ltd., (1994).
2. 2) Ginya Adachi : “Science of Rare Earth”, p.198, Kagakudojin., (1999).
3. Synthesis and Characterization of Environmentally Benign Nontoxic Pigments: RE2Mo2O9(RE = La or Pr)
4. 5) Phosphor Research Society : “Keikoutai-handbook”, p.114, Ohmsha, Ltd., (1987).