Referecnes
=================

The SPICE and SPICE-NS implemented here is described in:

- **Liu et al.** *Accessing the significance of brain maps associations through effective sample size estimation* (*in prep*).

The idea of spatial detrending is described in:

- **Liu et al.** *Spatial trends in brain maps: Evidence and recommendations* (*in prep*).

Dutilleul's derivation for effective sample size (SPICE and SPICE-NS):

- **Dutilleul P, Clifford P, Richardson S, Hémon D.** *Modifying the t test for assessing the correlation between two spatial processes.*  Biometrics. 1993;49:305-314.

Nonstationary covariance function based on process convolution (SPICE-NS):

- **Paciorek CJ, Schervish MJ.** *Spatial modelling using a new class of nonstationary covariance functions.*  Environmetrics. 2006;17(5):483-506.