Keller, Gerta, Hassan Khozyem, Thierry Adatte, N. Malarkodi, Jorge Spangenberg, and Wolfgang Stinnesbeck. (2013) 2013. “Chicxulub Impact Spherules in the North Atlantic and Caribbean: Age Constraints and Cretaceous–Tertiary Boundary Hiatus”. Geological Magazine 150 (05): 885-907. doi:10.1017/S0016756812001069.

Malarkodi, N., G. Keller, P. Fayazudeen, and U. Mallikarjuna. (2010) 2010. “Foraminifera from the Early Danian Intertrappean Beds in Rajahmundry Quarries, Andhra Pradesh”. Journal of the Geological Society of India 75 (6): 851-63. doi:10.1007/s12594-010-0066-0.