“…They determine the correlation function, the cross-correlation density function or correlation coefficients (Ren, Huang, 2020). Surface noise sources (wave noise), isotropic noise (Ren, Huang, 2020; Buckingham, 2012) and vector noise fields (Zhou et al, 2017) have also been analysed. In (Buckingham, 2011), noise sources are placed on the surface of spheres and their specimens, which is close to the noise model proposed in this paper.…”