TY - CONF AU - John Kitching AU - K Hollberg AU - R. Wynands C2 - 6^uth^Symposium on Frequency Standards and Metrology , St. Andrews, SC DA - 2001-01-01 LA - en PB - 6^uth^Symposium on Frequency Standards and Metrology , St. Andrews, SC PY - 2001 TI - Compact Microwave Frequency Reference Based on Coherent Population Trapping, ER -