Spatial covariance models

Bertil Matern (1960): Spatial Variation. Medd. Statens Skogsforskningsinst.49: 5, Ch 2-3.
(Reprinted in Springer Lecture Notes in Statistics, vol. 36)

Gelfand et al. ch. 2.3-7, 3.4-5, 5

Renshaw, E. and Ford, E. D. (1983). The Interpretation of Process from Pattern using Twodimensional
Spectral Analysis: Methods and Problems of Interpretation.
Applied Statistics 32: 51-63.

Richard H. Jones: Stochastic processes on a sphere. Annals Math. Statist. 34: 213-218.