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Lua i Stíl Chicago (17ú heag.)Rickli, J., M. Frank, R. Georg, agus A. Halliday. Carbonates, Riverine Chemistry and Incongruent Weathering of Hafnium. 2009.
Lua MLA (9ú heag.)Rickli, J., et al. Carbonates, Riverine Chemistry and Incongruent Weathering of Hafnium. 2009.
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