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McBride, M.B., Mortland, M.M. & Pinnavaia, T.J. Exchange Ion Positions in Smectite: Effects on Electron Spin Resonance of Structural Iron. Clays Clay Miner. 23, 162–164 (1975). https://doi.org/10.1346/CCMN.1975.0230213
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DOI: https://doi.org/10.1346/CCMN.1975.0230213