TY - RPRT TI - AC-DC difference calibrations AU - Kinard, J R AU - Hastings, J R AU - Lipe, T E AU - Childers, C B PY - 1989 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 250-27 DO - 10.6028/NIST.SP.250-27 ER -