1. Beenedetti, R., & Rossin, P. (1993). On the use of NDVI profiles as a tool for agricultural statistics: The case study of Wheat estimate and forecast in Emilia, Remote Sensing of Environment.
2. Berhan, G,. Hill S., Tadesse, T., & Atnafu, S. (2011). Using satellite images for drought monitoring: a knowledge discovery approach. Journal Strategic Innov Sustain, VOL. 7(1):135.
3. Dabrowska-Zielinska, K., Kogan, F.,Ciolkosz, A., Gruszynska, M., & Kowalik, W. (2002). Modelling of crop growth conditions and crop yield in Poland using AVHRR-based indices. International Journal of Remote Sensing, 23.
4. Ehrlich, PR,. & Holdren, JP. (1971). Impact of population growth. Science. VOL. 171(3977):1212–1217.
5. FAO. (2017). How close we are to zero Huhnger.
6. Hui ,C. (2006). Carrying capacity, population equilibrium, and environment’s maximal load. Ecol Modell. VOL. 192(1-2):317–320.
7. Jensen, J. R. (1996). Introductory digital image processing: Aremote sensing perspective, Upper Saddle River, New Jersey: Prentice Hall.
8. Kogan, F. N. (2001). Contribution of remote sensing to drought early warning. National Oceanic and Atmospheric Administration (NOAA), National Environmental Satellite Data and Information Services (NESDIS), Washington: DC. U.S.A.
9. Kogan, F,N. (2001). Operational space technology for global vegetation assessment. Bull Amer Meteor Soc. VOL. 82(9):1949–1964.
10. Kogan, F,N. (1997). Global drought watch from space. Bull Amer Meteor Soc. 78(4):621–636.
11. Kogan, F,N. (1995). Droughts of the late 1980s in the United States as derived from NOAA polar-orbiting satellite data. Bull Amer Meteor Soc. VOL. 76(5):655–667.
12. LOM. (2017). Liebig’s Law of the Minimum. https:,,en.wikipedia.org,wiki,Liebig%27s_law_of_ the_minimum.
13. Mckee, T.B., Doesken, N.J., & Kleist, J. (1993). The relationship of drought frequency and duration to time scales, Proceedings of the Eighth Conferences on Applied Climatology, American Meteorological Society, Boston,179-184.
14. Moulin, S. A., Bondeau, A, & Delecolle, R (1998). Combining regional scale, International Journal of Remote Sensing, 19.
15. Su ,ZB., Yacob, A., Wen, J., Roerink, G., He YB, Gao BH., Boogaard, H., & van Diepen, C. (2003). Assessing relative soil moisture with remote sensing data: theory, experimental validation, and application to drought monitoring over the North China Plain, Physics and Chemistry of the Earth, 28 (1-3).
16. Shelford, VE. (1931). Some concepts of bioecology. Ecology. VOL. 12(3):455–467. doi:10.2307,1928991. ISSN 1939-9170.
17. Tucker, C. J. (1979). Red and photographic infrared linear combinations for monitoring vegetation, Remote Sensing of Environment, 8.
18. Vicente-Serrano, SM, Cuadrat-Prats, JM., & Romo, A. (2006). Early prediction of crop production using drought indices at different time-scales and remote sensing data: application in the Ebro valley (North-East Spain), International Journal of Remotr Sensing, 27(3).