Keijzer, F.G., 1953. Reconsideration of the so-called Oligocene fauna in the asphaltic deposits of Buton (Malay Archipelago). Part II, Young Neogene Foraminifera and calcareous Algae. Leidsche Geol. Meded., 17 , p. 259-293.
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Keijzer, F.G., 1953. Reconsideration of the so-called Oligocene fauna in the asphaltic deposits of Buton (Malay Archipelago). Part II, Young Neogene Foraminifera and calcareous Algae. Leidsche Geol. Meded., 17 , p. 259-293