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| Dietary element (essential element Oleksandr Spirin); essential element (микроэлемент; Skinner, H.C.W. (2005). "Biominerals". Mineralogical Magazine 69 (5): 621–641. doi:10.1180/0026461056950275 Oleksandr Spirin) | |||
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| Dietary element (essential element Oleksandr Spirin); essential element (микроэлемент; Skinner, H.C.W. (2005). "Biominerals". Mineralogical Magazine 69 (5): 621–641. doi:10.1180/0026461056950275 Oleksandr Spirin) | |||