TY - CONF AU - Walls, F AU - Nelson, L AU - Valdez, G C2 - 6^uth^European Frequency and Time Forum , Noordwijk, PA DA - 1992-01-01 LA - en PB - 6^uth^European Frequency and Time Forum , Noordwijk, PA PY - 1992 TI - Designing for Frequency and Time Metrology at the 10-18 Level ER -