Jurina , A.L. and Raskatova, M.G. 2014. Svalbardia from Givetian of Central Russia (Voronezh Region): leaf morphology and spores from sporangium. Journal of Palaeosciences. 63, (1-2) (Dec. 2014), 99–112. DOI:https://doi.org/10.54991/jop.2014.324.