Sotomayor, M. D. P. T., Raimundo Júnior, I. M., Rohwedder, J. J. R. and Oliveira Neto, G. (2010) “A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system”, Eclética Química, 35(2), pp. 33–43. doi: 10.26850/1678-4618eqj.v35.2.2010.p33-43.