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Cooper, M. R., Perez, E. & Reyes, R. (1989). The systematic position of Trigonia nepos Paulcke, 1903, and Paulckella, a new genus for the Aptian of Chile. Revista Geologica de Chile. 16: 51-59.
Cooper, M. R., Perez, E. & Reyes, R. (1989). The systematic position of Trigonia nepos Paulcke, 1903, and Paulckella, a new genus for the Aptian of Chile. Revista Geologica de Chile. 16: 51-59.
