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Okawa, Hikohiro, Seiichi Morokuma, Kana Maehara, Akiko Arata, Yoshiyuki Ohmura, Takashi Horinouchi, Yukuo Konishi, و Kiyoko Kato. "Eye Movement Activity in Normal Human Fetuses between 24 and 39 Weeks of Gestation." PLoS One 2017.

Okawa, Hikohiro, et al. "Eye Movement Activity in Normal Human Fetuses between 24 and 39 Weeks of Gestation." PLoS One 2017.