Viswanathan, S., et al. “New Occurrence of Manganocolumbite from Late Proterozoic Pegmatites of Bhurpidungri, Jharsuguda District, Orissa”. Journal of Geological Society of India, vol. 67, no. 4, Apr. 2006, pp. 547-9, https://geosocindia.com/index.php/jgsi/article/view/82026.