Schmugge, T. 1981 Remote sensing of soil moisture with microwave radiometers. Paper 81-4503, 
Am.Soc.Agr.Engng 1981 Winter Meeting, Chicago. 
Tucker, CJ. 1979 Red and photographic infrared linear combinations for monitoring vegetation. Remote 
Sensing Environ. 8, 127. 
Tucker, CJ. 1980 A critical view of remote sensing and other methods for non-destructive estimation of 
standing crop biomass. Grass Forage Sci. 35, 177. 
Tucker, C. J., Hielkema, J.U. & Roffey, J. 1985 The potential of satellite remote sensing of ecological conditions 
for survey and forecasting desert locust activity. IntJ.Remote Sensing 6, 127-138. 
van Ingen Schenau, H.A., Nicolai, R.J., Venema, J.C., van der Laan, F.B. & Versteeg, M. 1986 System 
definition of ’Africa real time environmental monitoring using imaging satellites’ (ARTEMIS): National 
Aerospace Laboratory of the Netherlands (NLR). 
van Ingen Schenau, H.A., Venema, J.C., Spaa, J. & Hielkema, J.U. 1988 ARTEMIS System Overview and 
Presentation of ARTEMIS Products. Paper ITC/FAO Seminar, 14-25 November 1988, Enschede, 
Netherlands. 
Wetzel, P.J. & Atlas, D. 1981 Inference of precipitation through thermal measurement of soil mosture. 
Precipitation measurements from space. Workshop Report, April 28-May 1, 1981, NASA/Goddard Space 
Flight Center, pp. 170-172. 
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