Fatkhurrahman, J. A., I. R. J. Sari, Y. Andriani, M. S. Romadhon, N. Zen, A. Prasetio, and A. M. Simbolon. “DOAS Calibration Technique for SO2 Emission Measurement Based on H2SO4 and Na2SO3 Reaction”. Jurnal Riset Teknologi Pencegahan Pencemaran Industri, vol. 11, no. 1, May 2020, pp. 36-45, doi:10.21771/jrtppi.2020.v11.no1.p36-45.