When one rubs a pointed (iron) needle upon a lodestone, it acquires the property of pointing to the south….
— Pen Tshao Yen I (A 12th century Chinese Text)
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Raman, V.V. Darshana Jolts. Reson 17, 512–522 (2012). https://doi.org/10.1007/s12045-012-0056-1
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DOI: https://doi.org/10.1007/s12045-012-0056-1