TY - CONF AU - Neil Ashby AU - Thomas Heavner AU - Steven Jefferts AU - A Radnaev AU - Y Dudin C2 - Proc. 2007 Joint Mtg. IEEE Intl. Freq. Cont. Symp. and EFTF Conf., Geneva, CH DA - 2007-05-28 LA - en PB - Proc. 2007 Joint Mtg. IEEE Intl. Freq. Cont. Symp. and EFTF Conf., Geneva, CH PY - 2007 TI - Testing Local Position Invariance with Four H Masers AND Four Cs Fountains UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50569 ER -