H. Singh, M. Rao, and R. Saxena, “Palynology of the Barail (Oligocene) and Surma (Lower Miocene) sediments exposed along Sonapur-Badarpur Road Section, Jaintia Hills (Meghalaya) and Cachar (Assam). Part-VII. Discussion”, JPS, vol. 35, no. 1-3, pp. 331–341, Dec. 1986.