TY - JOUR AU - D Meekhof AU - Steven Jefferts AU - M Stepanovic AU - Tom Parker C2 - IEEE Transactions on Instrumentation and Measurement DA - 2001-01-01 00:01:00 LA - en M1 - 50 PB - IEEE Transactions on Instrumentation and Measurement PY - 2001 TI - Accuracy Evaluation of a Cesium Fountain Primary Frequency Standard at NIST ER -