Flotation measurements to reveal the reason for the discrepancy in the molar volume of silicon. - Horst Bettin; Hans Toth (IEEE Trans. Instrum. Meas., 2003)

Comparison of density difference measurements at PTB and NMIJ. - Horst Bettin; Hans Toth; Atsushi Waseda; Kenichi Fujii (IEEE Trans. Instrum. Meas., 2005)

Density Determination of a Small Isotopically Enriched Silicon Single Crystal. - Horst Bettin; Hans Toth (IEEE Trans. Instrum. Meas., 2007)