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Pre One: Sun, D., D. Helmberger, J. M. Jackson, R. W. Clayton, and D. J. Bower (2012), Rolling hills on the Core-Mantle Boundary, Earth Planet. Sci. Lett., doi:10.1016/j.epsl.2012.10.027
Next One: Sun, D. and D. Helmberger (2011), Upper mantle structures beneath USArray derived from waveform complexity, Geophys. J. Int., doi:10.1111/j.1365-246X.2010.04847.x