1. Assessment of the SMAP passive soil moisture product;Chan SK;IEEE Transactions on Geoscience and Remote Sensing,2016
2. "Validation of Soil Moisture Data Products From the NASA SMAP Mission,";Colliander A;IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing,2022
3. Delta-T Devices (1998) ThetaProbe ML2 user manual, page 16. Note the detailed error budget is no longer included in the ML3 manual. Delta-T Devices Ltd. Cambridge, England.
4. Entekhabi D, Njoku EG, O'Neill PE, Kellogg KH, Crow WT, Edelstein WN, Entin JK, Goodman SD, Jackson TJ, Johnson J and Kimball J (2010) The soil moisture active passive (SMAP) mission. Proceedings of the IEEE, 98(5), pp.704–716. DOI: 10.1109/JPROC.2010.2043918
5. GEWEX. (2021) Global Energy and Water EXchanges (GEWEX) Science Plan (2023–2032), WCRP Publication 9/2021; 12 pp. https://www.gewex.org/gewex-content/uploads/2022/11/GEWEX-science-plan-v8.pdf