Gautam, R., and V. Rai. “Branched Microbiota from the Bedded Black Chert of the Krol Formation (Neoproterozoic), Lesser Himalaya, India”. Journal of Palaeosciences, vol. 46, no. (1-2), Dec. 1997, pp. 32-40, doi:10.54991/jop.1997.1315.