Krassilov, V.A. “Approach to the Classification of Mesozoic ‘Ginkgoalean’ Plants from Siberia”. Journal of Palaeosciences 18, no. 1-3 (December 31, 1969): 12–19. Accessed November 28, 2024. https://jpsonline.co.in/index.php/jop/article/view/814.