Ramasubramanian, K. Tantrasangraha of nīlakantha somayājī [Electronic resource] / K. Ramasubramanian, M. Sriram. - Electronic text data. - London : Springer-Verlag, 2011. - (Sources and studies in the history of mathematics and physical sciences). - ISBN 978-0-857-29036-6 : Б. ц.