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Flanagan, Megan P.; Shearer, Peter M. (10 February 1998). "Global mapping of topography on transition zone velocity discontinuities by stacking precursors". Journal of Geophysical Research: Solid Earth. 103 (B2): 2673–2692. Bibcode:1998JGR...103.2673F. doi:10.1029/97JB03212.