Yukio Ōhashi 2000, p. 348. Yukio Ōhashi (2000). "Remarks on the Origin of Indo-Tibetan Astronomy". In Helaine Selin; Sun Xiaochun (eds.). Astronomy Across Cultures. Science Across Cultures: The History of Non-Western Science. Vol. 1. Dordrecht: Springer. pp. 341–369. doi:10.1007/978-94-011-4179-6_11. ISBN978-94-010-5820-9.