@book{han-nom-d8-q0tw-kn67,
  title = {Cửu chương lập thành toán pháp 九章立成算法},
  author = {Phạm, Phúc Cẩn},
  url = {https://viet-dien.com/t/han-nom-d8-q0tw-kn67/12},
  pages = {12},
  note = {held by Columbia University Libraries},
  urldate = {2026-09-13},
}