Perrin, C. (1994). Morphology of encrusting and free living acervulinid foraminifera: Acervulina, Gypsina and Solenomeris. Palaeontology. 37(2):425-458.
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Perrin, C.
1994
Morphology of encrusting and free living acervulinid foraminifera: Acervulina, Gypsina and Solenomeris