Álvarez-Vázquez, C.; Cleal, C. J. Wagneropteris Minima, a New Medullosalean Pteridosperm from the Middle Westphalian (Middle Plennsylvanian) of the Peñarroya-Belmez-Espiel Coalfield (Córdoba Province, SW Spain). Spanish J. Palaeontol. 2020, 31, 5-24.