Tiwari, R., A. Tripathi, and Vijaya. “Organic-Walled Microfossils of Doubtful Origin in Permian and Triassic Sequences on Peninsular India”. Journal of Palaeosciences, vol. 43, no. 1-3, Dec. 1994, pp. 1-38, doi:10.54991/jop.1994.1162.