Martínez-Pérez, C.; Valenzuela-Ríos, J.; Navas-Parejo, P.; Liao, J.-C.; Botella, H. Emsian (Lower Devonian) Polygnathids (Conodont) succession in the Spanish Central Pyrenees. JIGE 2011, 37 ,1, 45-64. https://doi.org/10.5209/rev_JIGE.2011.v37.n1.4.