R.
Liu
Schlamminger, S. ., Haddad, D. ., Seifert, F. ., Chao, L. S., Newell, D. B., Liu, R. ., … Pratt, J. R. (2014). Determination of the Planck constant using a watt balance with a superconducting magnet system at the National Institute of Standards and Technology. Metrologia, 51, S15-S24. http://doi.org/10.1088/0026-1394/51/2/s15
Schlamminger, S. ., Steiner, R. L., Haddad, D. ., Newell, D. B., Seifert, F. ., Chao, L. S., … Pratt, J. R. (2015). A summary of the Planck constant measurements using a watt balance with a superconducting solenoid at NIST. Metrologia, 52, L5-L8. http://doi.org/10.1088/0026-1394/52/2/l5