1. Christakos G, Vyas VM (1998) A composite space-time approach to studying zone distribution over eastern United States. Atmos Environ 32(16):2845–2857
2. Cressie N, Huang H (1999) Classes of nonseparable, spatio-temporal stationary covariance functions. J Am Stat Assoc 94(448):1330–1340
3. Cressie N, Wikle CK (2011) Statistics for spatio-temporal data. Wiley, New York
4. Deutsch CV, Journel AG (1998) GSLIB: geostatistical software library and user’s guide, 2nd edn. Oxford University Press, New York & Oxford, pp 63–94
5. De Cesare L, Myers DE, Posa D (1997) Geostatistics Wollongong’96. Kluwer Academic Publishers, Dordrecht, pp 1031–1042