1. A Quality Assurance Framework for Earth Observation: Principleshttp://qa4eo.org/docs/QA4EO_Principles_v4.0.pdf
2. A Guide to Expression of Uncertainty of Measurementshttp://qa4eo.org/docs/QA4EO-QAEO-GEN-DQK-006_v4.0.pdf
3. Report on Full Error Propagation Concept;Beekhuizen,2009