For more details, see Higdon D. (2002) Space and Space-Time Modeling using Process Convolutions. In: Anderson C.W., Barnett V., Chatwin P.C., El-Shaarawi A.H. (eds) Quantitative Methods for Current Environmental Issues. Springer, London.
References
Higdon, D. (2002). Space and space-time modeling using process convolutions. In Quantitative methods for current environmental issues (pp. 37-56). Springer London.
S. Surjanovic, D. Bingham, Virtual Library of Simulation Experiments: Test Functions
and Datasets, retrieved March 29, 2016, from https://www.sfu.ca/~ssurjano/hig02.html.