Longoria, J. F. & Gamper, M. A. (1975). Two new species of Upper Cretaceous planktonic Foraminiferida from the Abathomphalus mayaroensis zone of Mexico. Micropaleontology. 20(4): 473-477.
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Longoria, J. F. & Gamper, M. A. (1975). Two new species of Upper Cretaceous planktonic Foraminiferida from the Abathomphalus mayaroensis zone of Mexico. Micropaleontology. 20(4): 473-477