@book{53826,
	author = {Unknown},
	title = {周髀算經},
	publisher = {Project Gutenberg,},
	year = {2004},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://en.wikipedia.org/wiki/Zhoubi_Suanjing},
	url = {https://www.gutenberg.org/ebooks/12408}
}