Papp, A. and Küpper, K. (1954). The genus Heterostegina in the Upper Tertiary of Europe. Contributions from the Cushman Foundation for Foraminiferal Research. 5(3): 108-127.
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Papp, A. and Küpper, K. (1954). The genus Heterostegina in the Upper Tertiary of Europe.
Contributions from the Cushman Foundation for Foraminiferal Research