WAGNER, R. H. The Westphalian D floras of the Olloniego and Esperanza formations in the Central Asturian Coalfield. Trabajos de Geología, [S. l.], v. 4, n. 4, p. 461–507, 1971. DOI: 10.17811/tdg.4.1971.461-507. Disponível em: https://reunido.uniovi.es/index.php/TDG/article/view/2685. Acesso em: 18 abr. 2024.