By Le Bigot E -O   Jentschura U D   Indelicato P   Mohr P J   in Canadian Journal of Physics

ISSN:1208-6045|83|4|447-454

NRC Research Press‎(2005)‎

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By Taylor B. N.   Mohr P. J.   in Metrologia

ISSN:0026-1394|36|1|63-64

IOP Publishing‎(1999)‎

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