Seitz, Steffen, Petra Spitzer, Pia T. Jakobsen, and Hans D. Jensen. “Metrological Traceability Concept for Electrolytic Conductivity and PH”. CHIMIA 63, no. 10 (October 28, 2009): 640. Accessed April 29, 2024. https://www.chimia.ch/chimia/article/view/2009_640.