[1]
Bhargava, O.N. and Bassi, U.K. 1988. Trace Fossils from the Palaeozoic-Mesozoic Sequence of Spiti-Kinnaur (Himachal Himalaya) With Comments on Palaeoenvironmental Control on their Frequency. Journal of Geological Society of India. 32, 3 (Sep. 1988), 227–238.