Article Ryuji Hiraoka (2019)
Printed Editions and Manuscripts of Tianjing Huowen. Historia Scientiarum: International Journal of the History of Science Society of Japan (pp. 80-111). (/isis/citation/CBB234733502/) unapi

Article Ryuji 隆二 Hiraoka 平岡 (2019)
[Printed Editions and Manuscripts of Tianjing huowen] 『天経或問』の刊本と写本. 科学史研究 Kagakusi Kenkyu (History of Science) (pp. 2-21). (/isis/citation/CBB104714838/) unapi

Article Ryuji Hiraoka; Akihiko Watanabe (2015)
A Jesuit Cosmological Textbook in `Christian Century' Japan: De sphaera of Pedro Gomez (Part II). Sciamvs: Sources and Commentaries in Exact Sciences (pp. 125-223). (/isis/citation/CBB037691258/) unapi

Chapter Hiraoka, Ryuji (2010)
Copernicus as a Painter: His Concept of symmetria mundi between Renaissance Art Theory and Cosmology. In: Mikurokosumosu: shoki kindai seishinshi kenkyu 1 (p. 70). (/isis/citation/CBB001031737/) unapi

Article Hiraoka, Ryuji (2009)
Clavius and His Astronomical Data during the “Christian Century” in Japan. Historia Scientiarum: International Journal of the History of Science Society of Japan (p. 213). (/isis/citation/CBB000953467/) unapi

Chapter Hiraoka, Ryuji (2008)
The Transmission of Western Cosmology to 16th Century Japan. In: History of Mathematical Sciences: Portugal and East Asia III: The Jesuits, the Padroado and East Asian Science (1552--1773) (p. 81). (/isis/citation/CBB000950481/) unapi

Article Hiraoka, Ryuji (2008)
Clavius in Nanban Cosmology: Astronomical Data in Pedro Gomez's Compendium catholicae veritatis and Its Sources. 科学史研究 Kagakusi Kenkyu (History of Science) (p. 95). (/isis/citation/CBB000930014/) unapi

Article Hiraoka, Ryuji (2007)
The Manuscript Tenmongata kakitome (Astronomer's Note): Mixture of Nanban and Rangaku Astronomy. 科学史研究 Kagakusi Kenkyu (History of Science) (p. 65). (/isis/citation/CBB000720250/) unapi

Article Hiraoka, Ryuji (2005)
Jesuit Cosmological Textbook in “the Christian Century” Japan: De sphaera of Pedro Gomez (Part I). Sciamvs: Sources and Commentaries in Exact Sciences (p. 99). (/isis/citation/CBB000651326/) unapi

Article Hiraoka, Ryuji; Hibi, Kayoko (2004)
The Sokuryō-higen (Private Letters on Surveying) Edited by Hosoi Kōtaku. 科学史研究 Kagakusi Kenkyu (History of Science) (p. 94). (/isis/citation/CBB000600643/) unapi