Documents & publications

Reports
FLEX Report for Mission Selection (ESA SP-1330/2, June 2015)
FLEX Mission Requirements Document (ESA, June 2018)

Studies 
Photosynthesis study
Bridge study
Level-1B to Level-2 retrieval study

Scientific papers
Geophysical Research Letters (February 2015)
Red and far-red Sun-induced chlorophyll fluorescence as a measure of plant photosynthesis