TY - CONF AU - Allan, D AU - Lewandowski, W AU - Thomas, C C2 - ION Global Position System Conf , Albuquerque, NM DA - 1991-01-01 LA - en PB - ION Global Position System Conf , Albuquerque, NM PY - 1991 TI - CGSIC Subcommittee on Time and CCDS Group of Experts on GPS Standardization ER -