TY - GEN AU - T A Siewert AU - C M Wang AU - C N McCowan C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2000-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.SP.260-141 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2000 TI - Standard Reference Materials:Secondary ferrite number reference materials gage calibration and assignment of values ER -