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4. Robert F. Berg and Giorgio Cignolo, NIST-IMGC Comparison of Gas Flows Below One Litre per Minute, Metrologia, 40 (2003) 154–158.
5. Thiago Cobu, Robert F. Berg, John D. Wright and Michael R. Moldover, Modeling Laminar Flow Meters for Process Gases, Proceedings of FLOMECO, Taipei, Taiwan, (2010).