Bharadwaj, D.C. 1958. “On Porostrobus Zeilleri Nathorst and Its Spores With Remarks on the Systematic Position of P. Bennholdi Bode and the Phylogeny of Densosporites Berry”. Journal of Palaeosciences 7 ((1-2):67-75. https://doi.org/10.54991/jop.1958.571.