GARCÍA-RAMOS, J. C.; ARAMBURU, C.; BRIME, C. Kaolin tonstein of volcanincs ash origin in the Lower Ordovician of the Cantabrian Mountains (NW Spain). Trabajos de Geología, [S. l.], v. 14, n. 14, p. 27–35, 1984. DOI: 10.17811/tdg.14.1984.27-35. Disponível em: https://reunido.uniovi.es/index.php/TDG/article/view/2777. Acesso em: 29 abr. 2024.