"Early Earth: Oxygen for heavy-metal fans" | "Hemoglobin and hemin induce DNA damage in human colon tumor cells HT29 clone 19A and in primary human colonocytes" |
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"An ancient wind powered iron smelting technology in Sri Lanka" | "Paleoecological Significance of the Banded Iron-Formation" |
Van Der Merwe, 'Radiocarbon Chronology of the Iron Age in Sub-Saharan Africa' Current Anthropology 1968 | Needham, Volume 4, Part 1, 282 |
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; Wiberg, Egon; Wiberg, Nils; 1985 | The History of Sub-Saharan Africa |