• DIN 19266
• DIN 19267
• Measurement of pH. Definition, standards, and procedures (IUPAC Recommendations 2002) - pdf file
• R.G. Bates, Determination of pH, Wiley, New York, 1965.
• Hans Bjarne Christensen, Arne Salomon and Gert Kokholm, International pH Scales and Certification of pH, Anal. Chem. vol. 63, no. 18, 885A - 891A ,1991.

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