安岛直圆

安岛直圆（；），字伯規，号南山，日本江户时代中期的財政家、数学家。新庄藩藩士。他精通和算，與關孝和並稱「和算二大焦點」。他的贡献包括有关对数的研究和对《线上累圆术》的归纳法的改进。

参考
扩展阅读

• Endō Toshisada (1896). . Tōkyō: _____. [http://www.worldcat.org/title/dai-nihon-sugakushi-history-of-mathematics-in-japan-by-endo-toshisada/oclc/122770600&referer=brief_results OCLC 122770600]
• Oya, Shin'ichi. (1970). "Ajima Naonobu" in Dictionary of Scientific Biography, Vol. 1. New York: Charles Scribner's Sons. ISBN 0-684-10114-9
• Restivo, Sal P. (1992). [http://books.google.com/books?id=gvMm0jv-xPIC&dq=Yoshida+Koyu+arithmetic&source=gbs_navlinks_s Mathematics in Society and History: Sociological Inquiries.] Dordrecht: Kluwer Academic Publishers. ISBN 0-7923-1765-3/ISBN 978-0-7923-1765-4; [http://www.worldcat.org/title/mathematics-in-society-and-history-sociological-inquiries/oclc/25709270 OCLC 25709270]
• Selin, Helaine. (1997). [http://books.google.com/books?id=raKRY3KQspsC&dq=Aida+Yasuaki&source=gbs_navlinks_s Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures.] Dordrecht: Kluwer/Springer. ISBN 0-7923-4066-3/ISBN 978-0-7923-4066-9; [http://www.worldcat.org/title/encyclopaedia-of-the-history-of-science-technology-and-medicine-in-non-western-cultures/oclc/186451909 OCLC 186451909]
• David Eugene Smith and Yoshio Mikami. (1914). [http://books.google.com/books?id=J1YNAAAAYAAJ&dq=Shiraishi+Chochu&source=gbs_navlinks_s A History of Japanese Mathematics.] Chicago: Open Court Publishing. [http://www.worldcat.org/title/history-of-japanese-mathematics/oclc/1515528 OCLC 1515528] [http://www.archive.org/details/historyofjapanes00smitiala -- note alternate online, full-text copy at archive.org]