TY - JOUR AU - Zimmerman, J. AU - Beall, James AU - Cromar, M. AU - Ono, Ronald C2 - Applied Physics Letters DA - 1987-08-24 00:08:00 LA - en M1 - 57 PB - Applied Physics Letters PY - 1987 TI - Operation of a YBa2Cu3Ox rf-SQUID at 81 K ER -