Awasthi, N., Guleria, J., Prasad, M. and Srivastava, R. (1994) “Occurrence of acrostichum linn., a coastal fern in the Tertiary sediments of Kasauli, Himachal Pradesh, north-west Himalaya”, Journal of Palaeosciences, 43(1-3), pp. 83–87. doi: 10.54991/jop.1994.1178.