References for Sankara Narayana

Books:

1. G Ifrah, A universal history of numbers : From prehistory to the invention of the computer (London, 1998).
2. P K Majumdar, A rationale of Bhatta Govinda's method for solving the equation ax - c = by and a comparative study of the determination of 'Mati' as given by Bhaskara I and Bhatta Govinda, Indian J. Hist. Sci. 18 (2) (1983), 200-205.

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