TY - RPRT TI - 4DRCS : a reference model architecture for unmanned vehicle systems version 2.0 AU - Albus, James AU - Huang, Hui-Min AU - Messina, Elena AU - Murphy, Karl PY - 2002 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 6910 DO - 10.6028/NIST.IR.6910 ER -