[1]
O. N. Bhargava and U. K. Bassi, “Trace Fossils from the Palaeozoic-Mesozoic Sequence of Spiti-Kinnaur (Himachal Himalaya) With Comments on Palaeoenvironmental Control on their Frequency”, jgsi, vol. 32, no. 3, pp. 227–238, Sep. 1988.