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Thomas, D. M., Leonard, A. W., Lao, L. L., Osborne, T. H., Müller, H. W., & Finkenthal, D. F. (2004). Measurement of Pressure-Gradient-Driven Currents in Tokamak Edge Plasmas. Physical Review Letters, 93: 065003. doi:10.1103/PhysRevLett.93.065003.