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[文献書誌] Tetsuo Harada et al.: "How do morningness-eveningness preferences change in accordance with aging in Japanese elementary school to university students?"Proceedings of International Congress on Chronobiology, 1999, Washington D.C.. 1. 46 (1999)
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[文献書誌] Hitomi Takeuchi et al. & Tetsuo Harada: "Past discipline at home makes Japanese junior high school students prefer morningness"Proceedings of International Congress on Chronobiology, 1999, Washington D.C.. 1. 85 (1999)
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[文献書誌] Tetsuo Harada et al.: "Do meal timings affect the morningness-eveningness preference and timings of going-to-bed and rising in Japanese students?"Proceedings of The 8^<th> Sapporo Symposium on Biological Rhythm. 1. 54 (1999)
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[文献書誌] Natsumi Hino et al. & Tetsuo Harada: "Effect of light conditions during sleep period on morningness-eveningness preference by Japanese students"Proceedings of The 8^<th> Sapporo Symposium on Biological Rhythm. 1. 55 (1999)
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[文献書誌] 日野菜摘他、原田哲夫: "児童・生徒・学生における睡眠時の光環境は彼らの朝型―夜型度にどのような影響を及ぼすのか?"日本時間生物学会会誌. 5巻2号. 93 (1999)
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[文献書誌] 竹内日登美他、原田哲夫: "家族間の会話頻度が中学生の朝型―夜型度に与える影響"日本時間生物学会会誌. 5巻2号. 94 (1999)
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[文献書誌] 松岡綾他、原田哲夫: "食事習慣と朝型―夜型度、大学生と専門学校生を中心にした疫学的調査"日本時間生物学会会誌. 5巻2号. 95 (1999)
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[文献書誌] 原田哲夫他: "児童・生徒の生活リズム研究II"高知大学教育学部研究報告. 58号. 11-31 (1999)
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[文献書誌] Tetsuo Harada et al.: "Endocrine, ecophysiological aspects of seasonal adaptations in a water strider, Aquarius paludum (a mini review)"Entomological Science. 3. 157-165 (2000)