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Hakala, T; Markelin, L; Honkavaara, E; Scott, B; Theocharous, T; Nevalainen, O; Näsi, R; Suomalainen, J; Viljanen, N; Greenwell, C; Fox, N (2018) Direct Reflectance Measurements from Drones: Sensor Absolute Radiometric Calibration and System Tests for Forest Reflectance Characterization. Sensors, 18 (5). 1417 ISSN 1424-8220