Knight JA, Sardina LJ. An emended and amplified description of Pecopteris apicalis Knight, a fern morphospecies of mid-Stephanian age from NW Spain. Spanish J. Palaeontol. [Internet]. 25 de abril de 2020 [citado 10 de enero de 2025];31(1):95-114. Disponible en: https://pasquin.uv.es/index.php/sjpalaeontology/article/view/17141