Liêm, N. V. (1966). Some Triassic foraminifera from Hoang Mai Limestone, Nghe An Province, North Vietnam. Acta Scientiarum Vietnamicarum, Sectio Geographicarum et Geologicarum. 1: 37-44.
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Liêm, N. V. (1966). Some Triassic foraminifera from Hoang Mai Limestone, Nghe An Province, North Vietnam. <em>Acta Scientiarum Vietnamicarum, Sectio Geographicarum et Geologicarum.</em> 1: 37-44.