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Qi, Wenlu; Lee, Seung-Kuk; Hancock, Steven; Luthcke, Scott; Tang, Hao; Armston, John; Dubayah, Ralph . (2019). Improved forest height estimation by fusion of simulated GEDI Lidar data and TanDEM-X InSAR data. Remote Sensing of Environment, 221(), 621–634. doi:10.1016/j.rse.2018.11.035 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research