[1]
Krassilov, V.A. and Doludenko, M.P. 2004. New Jurassic protocycadalean ovuliphores and the origins of the Cycadales. Journal of Palaeosciences. 53, (1-3) (Dec. 2004), 83–89. DOI:https://doi.org/10.54991/jop.2004.211.