TY - RPRT TI - SAFE50 Reference Design Study for Large-Scale High-Density Low-Altitude UAS Operations in Urban Areas AU - Ippolito, Corey A. AU - Krishnakumar, Kalmanje AU - Stepanyan, Vahram AU - Chakrabarty, Anjan AU - Baculi, Josh PY - 2019 UR - https://ntrs.nasa.gov/citations/20190032259 ID - 20190032259 ER -