Bharadwaj, D.C. “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, no. (1-2) (December 31, 1958): 67–75. Accessed May 17, 2024. https://www.jpsonline.co.in/index.php/jop/article/view/571.