Viséan-Serpukhovian (Early Carboniferous) ammonoids from the alba formation, Esla Syncline, Cantabrian Mountains preliminary study. Zubía, [S. l.], n. 42, p. 19–24, 2026. Disponível em: https://publicacionesier.es/zubia/article/view/11. Acesso em: 18 may. 2026.