WAGNER, R. H. The stratigraphy and structure of the Ciñera-Matallana Coalfield (prov. León, N.W. Spain). TRABAJOS DE GEOLOGÍA, [S. l.], v. 4, n. 4, p. 385–431, 1971. DOI: 10.17811/tdg.4.1971.385-431. Disponível em: https://reunido.uniovi.es/index.php/TDG/article/view/2683. Acesso em: 22 jul. 2024.