TY - CONF AU - Parker, Thomas AU - Levine, Judah C2 - 1996 IEEE Int. Freq. Cont. Symp. , Honolulu, HI DA - 1996-01-01 LA - en PB - 1996 IEEE Int. Freq. Cont. Symp. , Honolulu, HI PY - 1996 TI - Recent Improvements in the Performance of the NIST AT1 Time Scale ER -