References for Lalla

  1. D Pingree, Biography in Dictionary of Scientific Biography (New York 1970-1990). See THIS LINK.
  1. G Ifrah, A universal history of numbers : From prehistory to the invention of the computer (London, 1998).
  1. B Chatterjee, A glimpse of Aryabhata's theory of rotation of earth, Indian J. History Sci. 9 (1) (1974), 51-55; 141
  2. R C Gupta, Aryabhata I's value of π, Math. Education 7 (1973), B17-B20.
  3. M Yano, Aryabhata's possible rebuttal to objections to his theory of the rotation of the Earth, Historia Sci. No. 19 (1980), 101-105.