About the existing discrepancy in the determinations of the Avogadro constant. - Jens Martin; Horst Bettin; Ulrich Kuetgens; Detlef Schiel; Peter Becker 003 (IEEE Trans. Instrum. Meas., 1999)

A Bragg silicon lattice comparator. - Franco Alasia; Giuseppe Basile; Peter Becker 003; Ulrich Kuetgens; J. Stümpel; Marco Servidori; Jürgen Härtwig (IEEE Trans. Instrum. Meas., 2001)

The Avogadro problem: summary of tests on crystal imperfections. - Peter Becker 003; Ulrich Kuetgens; J. Stümpel (IEEE Trans. Instrum. Meas., 2001)

Present State of the avogadro constant determination from silicon Crystals with natural isotopic compositions. - Kenichi Fujii; Atsushi Waseda; Naoki Kuramoto; Shigeki Mizushima; Peter Becker 003; Horst Bettin; R. Arnold Nicolaus; Ulrich Kuetgens; Staf Valkiers; Philip Taylor 001; Paul De Bievre; Giovanni Mana; et al. (IEEE Trans. Instrum. Meas., 2005)

Confirmation of the INRiM and PTB Determinations of the Si Lattice Parameter. - Peter Becker 003; Giovanni Cavagnero; Ulrich Kuetgens; Giovanni Mana; Enrico Massa (IEEE Trans. Instrum. Meas., 2007)

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)