WAGNER, R. H. Two little known species of Sphenophyllum from the Stephanian of Spain and France. Journal of Palaeosciences, [S. l.], v. 25, n. 1-3, p. 565–581, 1976. DOI: 10.54991/jop.1976.1044. Disponível em: https://jpsonline.co.in/index.php/jop/article/view/1044. Acesso em: 21 may. 2024.