Yutaka Amao, and Naoki Nakamura. An optical sensor with the combination of colorimetric change of α-naphtholphthalein and internal reference luminescent dye for CO2 in water // Sensors and Actuators B: Chemical
Volume 107, Issue 2, 29 June 2005, Pages 861-865
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http://dx.doi.org/doi:10.1016/j.snb.2004.12.028
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