Investigations on Diameter Measurements of the Avogadro Silicon Sphere Dependent on the Position in the Field of View of the Interferometer Optics. - Guido Bartl; R. Arnold Nicolaus (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)

Current State of Avogadro 28Si sphere S8. - R. Arnold Nicolaus; Guido Bartl; Horst Bettin; Michael Borys; Martin Firlus; Ingo Busch; Andre Felgner; Rolf Kruger-Sehm; Michael Krumrey; Michael Krystek; Ulrich Kuetgens (IEEE Trans. Instrum. Meas., 2013)