Rodríguez, S., Sando, W. J., & Kullman, J. (1986). Utility of corals for biostratigraphic and zoogeographic analysis of the Carboniferous in the Cantabrian Mountains, Northern Spain. TRABAJOS DE GEOLOGÍA, 16(16), 37–61. https://doi.org/10.17811/tdg.16.1986.37-61