Precision determination of the density of a single crystal silicon sphere and evaluation of the Avogadro constant. - Michael J. Kenny; Achim J. Leistner; Christopher J. Walsh; Kitty Fen; Walter Giardini; Leszek S. Wielunski; Roger P. Netterfield; Bradley R. Ward (IEEE Trans. Instrum. Meas., 2001)

Density of a Single-Crystal Natural Silicon Sphere. - Walter Giardini; Peter Manson; Michael Wouters; Bruce Warrington; Brad Ward; Noel Bignell; Chris Walsh; Esa Jaatinen; Michael J. Kenny (IEEE Trans. Instrum. Meas., 2009)

Diameter Comparison of a Silicon Sphere for the International Avogadro Coordination Project. - Naoki Kuramoto; Kenichi Fujii; R. Arnold Nicolaus; Guido Bartl; Malcolm Gray; Peter Manson; Walter Giardini (IEEE Trans. Instrum. Meas., 2011)