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Homotopy formulas for the magnetic vector potential and magnetic helicity: The Parker spiral interplanetary magnetic field and magnetic flux ropes - Webb - 2010 - Journal of Geophysical Research: Space Physics - Wiley Online Library
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Homotopy formulas for the magnetic vector potential and magnetic helicity: The Parker spiral interplanetary magnetic field and magnetic flux ropes - Webb - 2010 - Journal of Geophysical Research: Space Physics - Wiley Online Library
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