Mueller, T.G., N.B. Pusuluri, P.L. Cornelius, K.K. Mathias, R.I. Barnhisel, and S.A.
2004. Map quality for ordinary kriging and inverse distance weighted interpolation.
Soil Science Society of America Journal. http://soil.scijournals.org/cgi/content/abstract/68/6/2042
Authors: Richard Barnhisel, Paul Cornelius, Tom Mueller