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Das, Sukumar Ranjan (December 1928). "The Equation of Time in Hindu Astronomy". The American Mathematical Monthly. 35 (10): 540–543. doi:10.2307/2298168. JSTOR2298168.
Burgess, Ebenezer (1858). "Translation of the Surya-Siddhanta, A Text-Book of Hindu Astronomy; With Notes, and an Appendix". Journal of the American Oriental Society. 6: 183–186. doi:10.2307/592174. JSTOR592174.
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Schmidt, Olaf H. (1944). "The Computation of the Length of Daylight in Hindu Astronomy". Isis. 35 (3). The University of Chicago Press: 205–211. doi:10.1086/358709. JSTOR330729. S2CID145178197.
Swerdlow, N. (January 1973). "A Lost Monument of Indian Astronomy:Das heliozentrische System in der griechischen, persischen und indischen Astronomie B. L. van der Waerden". Isis. 64 (2): 239–243. doi:10.1086/351088. S2CID146253100.