1. Atlas, D. and Thiele, O.W. 1981.Precipitation Measurements from Space, 225Greenbelt, Md. USA: NASA, Goddard Space Flight Center.
2. Barrett, E.C. Hierarchical Approaches to Operational Satellite Rainfall Monitoring. In Satellite Techniques for Estimating Precipitation. Proceedings of the International Workshop on Satellite Techniques for Estimating Precipitation. Herndon, Va. pp.37–60.
3. Barrett, E. C. and Beaumont, M.J. 1987.Preparatory Study for Satellite‐based Rainfall Estimation of Southern Italy and Surrounding Areas, Final Report 39Rome, Italy Purchase Order No. 8760904, Telespazio s.p.a.
4. Barrett, E.C., Herschy, R.W. and Stewart, J.B. 1986.The Columbus Project: Space Station User Requirements for Hydrology, Final Report, Contract No. F60/96/15 85Natural Environment Research Council.
5. Satellite remote sensing requirements for hydrology and water management from the mid-1990s, in relation to the Columbus Programme of the European Space Agency