Bernardes-De-Oliveira, M., M. De Castro-Fernandes, R. Tewari, and F. Ricardi-Branco. “Platyspermic Seeds from the Early Permian of Parana Basin, Brazil”. Journal of Palaeosciences, vol. 56, Dec. 2007, pp. 1-19, doi:10.54991/jop.2007.59.