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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.
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Cooper, M. R., Perez, E. & Reyes, R.
1989
The systematic position of <em>Trigonia nepos</em> Paulcke, 1903, and <em>Paulckella</em>, a new genus for the Aptian of Chile
Revista Geologica de Chile
16: 51-59
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Paulckella M. R. Cooper, E. PĂ©rez & Reyes, 1989 † (original description)