Drooger, C. W. (1952). Foraminifera from the Cretaceous–Tertiary transitional strata of the Hodna mountains, Algeria. Contr. Cushm. Found. Foram. Res. 3(2): 89–103.
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Drooger, C. W. (1952). Foraminifera from the Cretaceous–Tertiary transitional strata of the Hodna mountains, Algeria