Talk:Tian yuan shu

Sources to add
Japanese encyclopedias:
 * http://kotobank.jp/word/%E5%A4%A9%E5%85%83%E8%A1%93
 * http://www.weblio.jp/content/%E5%A4%A9%E5%85%83%E8%A1%93

Google Books:
 * http://books.google.com/books?id=raKRY3KQspsC&pg=PA644&dq=%22Tianyuan+shu%22&as_brr=3&client=firefox-a&cd=6#v=onepage&q=%22Tianyuan%20shu%22&f=false
 * http://books.google.com/books?id=oXjMYIonXTYC&pg=PA298&dq=%22Tianyuan+shu%22&as_brr=3&client=firefox-a&cd=8#v=onepage&q=%22Tianyuan%20shu%22&f=false
 * http://books.google.com/books?id=yoiXDTXSHi4C&pg=PA45&dq=%22tian+yuan+shu%22&as_brr=3&cd=3#v=onepage&q=%22tian%20yuan%20shu%22&f=false
 * http://books.google.com/books?id=jaQH6_8Ju-MC&pg=PA247&dq=%22Tian+yuan+shu%22&as_brr=3&client=firefox-a&cd=2#v=onepage&q=%22Tian%20yuan%20shu%22&f=false
 * http://books.google.com/books?id=DWG9U5ru-nMC&pg=PA360&dq=%22Tianyuan+shu%22&as_brr=3&client=firefox-a&cd=2#v=onepage&q=%22Tianyuan%20shu%22&f=false
 * http://books.google.com/books?id=pTcQsvfbSu4C&pg=PA102&dq=tengenjutsu&as_brr=3&cd=4#v=onepage&q=tengen&f=false

Other:
 * http://ci.nii.ac.jp/naid/110000033366/en
 * http://www.britannica.com/EBchecked/topic/1238455/East-Asian-mathematics/66048/The-method-of-the-celestial-unknown#toc66048