Wagner, Robert Herman, and Enrique Martínez-García. “Floral Remains from the Highest Valdeón Formation, a Marine Stephanian Unit South of the Picos De Europa, and Comparisons With Eastern Asturias, NW Spain”. Spanish Journal of Palaeontology, vol. 13, no. 1, Mar. 2022, pp. 93-106, doi:10.7203/sjp.24038.