TY - CONF AU - Thomas Heavner AU - Stephan Barlow AU - Marc Weiss AU - Neil Ashby AU - Steven Jefferts C2 - Proceedings of the ION GNSS 2011 Conference, Portland, OR DA - 2011-09-20 LA - en PB - Proceedings of the ION GNSS 2011 Conference, Portland, OR PY - 2011 TI - A Laser-Cooled Frequency Standard for GPS ER -