TY - GEN AU - A H Kahn AU - T Chang C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1978-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.SP.260-59 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1978 TI - Standard Reference Materials ::Electron paramagnetic resonance intensity standard / ER -