TY  - RPRT
TI  - A pointable, helicopter-based remote sensing data acquisition system for collecting bidirectional reflectance data
AU  - Williams, Darrel L.
AU  - Walthall, Charles L.
AU  - Young, Douglas
PY  - 1991
UR  - https://ntrs.nasa.gov/citations/19910016177
ID  - 19910016177
ER  -