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  1. Āryabhaṭīya of Āryabhṭa, Cr. Edn. & Tr. by K. S. Shukla and K. V. Sarma, Indian National Science Academy, New Delhi, 1976.
  2. Āryabhaṭīya of Āryabhaṭa with the Commentary of Bhāskarācārya and Someśvara, ed. by K. S. Shukla. Indian National Science Academy, New Delhi, 1976, p. 88.
  3. Āryabhaṭīya of Āryabhaṭa, Cr. Edn. & Tr., p. 96.
  4. Śiṣyadhivṛddhida with the commentary of Mallikārjuna Sūri, ed. by Bina Chatterji, Indian National Science Academy, New Delhi 1981.
  5. See Āryabhaṭīya, Cr. Edn. &. Tr., p. 97.
  6. For detailed references see : Varāhamihira's Bṛhatasaṃhitā, Ed., & Tr. by M. Ramakrishna Bhat, Motilal Banarsidass, Delhi, 1981, pt. I, pp. 177-78; J. F. Fleet, The Topographical List of Brihat Saṃhita, ed. K. K. Das Gupta, Semushi, Calcutta, 1973, p. 20; K. D. Bajpai, The Geographical Encyclopaedia of Ancient and Medieval India, Indic Academy, Varanasi, 1967, pp. 35-36, Āryabhaṭīya, Cr. Edn. by K. S. Shukla and K.V. Sarma, op. cit., Introduction, pp. xxix-xxx.
  7. Vide Āryabhaṭīya, Cr. Edn. & Tr., Introduction, pp. xxxv-xxii.
  8. David Pingree, Census of Exact Sciences in India, Philadelphia, Ser. A. Vol. I, 1970, p. 50.
  9. See M. M. Patkar, "Geographical Data in Sanskrit Lexicons," Bulletin of the Deccan College Research Institute, 14.4 (March 1953) 249-305,
  10. Vide D. G. Apte, Universities of Ancient India, Baroda, p. 30. See also, Kripa Shankar Shukla, Āryabhaṭa : Indian Mathematician and Astronomer (5th century AD.) New Delhi 1976.