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Huber, Christian and Werner, Tobias and Krause, Christian and Wolfbeis, Otto S. and Leiner, Marc J. P. (1999) Overcoming the pH dependency of optical sensors: a pH-independent chloride sensor based on co-extraction. Analytica Chimica Acta 398, pp. 137-143.
Krause, Christian and Werner, Tobias and Huber, Christian and Wolfbeis, Otto S. and Leiner, Marc J. P. (1999) pH-Insensitive Ion Selective Optode: A Coextraction-Based Sensor for Potassium Ions. Analytical Chemistry 71 (8), pp. 1544-1548.