D. @bullet-pingree, Jyotih . ´ s¯ astra. A History of Inidan litterature, Volume VI, Fasc, vol.4, 1981.

T. A. @bullet-sarasvati-amma, Geometry in Ancient and Medieval India, 1979.

@. Sarma and S. R. , Rule of Three and its Variations in India, From China to Paris, pp.133-156, 2000.

@. Sastri and K. , Mah¯ abh¯ askar¯ ?ya of Bh¯ askar¯ ac¯ arya with the Bh¯ as . ya of Govindasv¯ amin and Supercommentary Siddh¯ antad¯ ?pik¯ a of Parame´svaraParame´svara, 1957.

@. Shukla and K. S. , Mah¯ abh¯ askar¯ ?ya, Edited and Translated into English , with Explanatory and Critical Notes, and Comments, etc, 1960.

@. Srinivas and M. D. , The Methodology of Indian Mathematics and its contemporary relevance, In History of Science and Technology in, 1990.