Matern spectral density $$f(\omega) = \frac{\sigma^2 \alpha^{2\nu}}{\pi^{d/2}(\alpha^2+\omega^2)^{\nu+d/2}}$$
Equivalence and Orthogonality of Matern Gaussian measure,布布扣,bubuko.com
Equivalence and Orthogonality of Matern Gaussian measure
原文：http://www.cnblogs.com/zhongjzsb/p/3611382.html