Y. Takigami, H. Sakai, Y. Orihashi, and K. Yokoyama, “⁴⁰Ar-³⁹Ar dating of Proterozoic basaltic and granitic rocks in the Nepal Himalaya and their comparison with those in Singbhum area, peninsular India”, Himalayan Journal of Sciences, vol. 2, no. 4, pp. 260–261, Feb. 2008.