6Dadson R S,Lewis S L, Peggs G N . The pressure balance:theory and practice [ M ]. London : HMSO, 1982.
7Yang Y C, Yue J. Calculation of effective area for the NIM primary pressure standards [ J ]. PTB - Mitteilungen,2011 ( 121 ) : 226 - 228.
8Ehawil A A, Gelary S A, Olson D A. Results of hydraulic pressure comparison in the range of 25MPa to 200MPa between NIS - Egypt and NIST - USA [ J ]. MAPAN - Journal of Metrology Society of India,2011,26 (4) :349 -355.
