3Comegna V, Vitale C. Space-time analysis of water status in a volcanic Vesuvian soil. Geoderma, 1993,60:135-158.
4Wendroth O, Rogasik H, Koszikski S, et al. State-space prediction of field-scale soil water content time series in a sandy loam. Soil and Tillage Research,1999,50:85-93.