Experimental determinations of the quantity M//spl rho/ for silicon single crystals used in the determination of the Avogadro constant
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M. Tanaka | P. De Biévre | K. Fujii | H. Bettin | S. Valkiers | Y. Nezu | A. Sacconi | A. Peuto | F. Spieweck | M. Mosca | S. Peiser