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Burkhard & Jackson 1976
Burkhard, N.R. and Jackson, D.D. (1976). Density and surface wave inversion. Geophysical Research Letters 3: doi: 10.1029/GL003i011p00637. issn: 0094-8276.

A useful measure of the importance of a given parameter in an inverse problem is the standardized partial derivative, which is scaled by the a priori uncertainty of the parameter in question. Because the density distribution in the upper mantle is poorly known, the a priori uncertainty for density is rather large; thus density must generally be considered as a variable in the inversion of surface wave phase velocity data.

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Geophysical Research Letters
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