Ramanujam, C.G.K., and K. Purnachandra Rao. “Study of the Pollen Grains of Ctenolophonidites from the Warkalli Deposits of South India With a Note on the Geological History of Ctenolophon”. Journal of Palaeosciences 20, no. 1-3 (December 31, 1971): 210–215. Accessed February 21, 2025. https://jpsonline.co.in/index.php/jop/article/view/898.