4I. M. Mills, P. J. Mohr, T. J. Quinn, et al. Redefinition of the Kilogram: A Decision Whose Time Has Come[J]. Metrologia, 2005, 42 (2) : 71 -80.
5STEINER R L, WILLIAMS E R. Uncertainty Improvements of the NIST Electronic Kilogram[ J]. IEEE Trans. Instrum. Meas. 2007,56 (2) : 592-596.
6Z. Zhang, Q. He, Z. Li. An Approach for Improving the Watt Balance [ A]. Filippo LEVI and Macro PISANI, CPEM 2006 [ C ], Tori no, Italy: 2006:126 - 127.
