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Héctor Botella, Carlos Martínez-Pérez and Rodrigo Soler-Gijón. 2012. Machaeracanthus goujeti n. sp. (Acanthodii) from the Lower Devonian of Spain and northwest France, with special reference to spine histology. Geodiversitas, 34 (4): 761-783. doi: 10.5252/g2012n4a3 (PDF)
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Carlos Martínez-Pérez and Jose Ignacio Valenzuela-Ríos. 2012. Polygnathids (Conodonta) around the lower/upper Emsian boundary from La Guardia d’Àres section (Lower Devonian, Spanish Central Pyrenees). Bollettino della Società Paleontologica Italiana, 51(3) : 193-202. doi:10.4435/BSPI.2012.22 (PDF)