Lapian, J., A. Tangkilisan, W. Sukanto, C. Tamburian, and F. G. Langi. “Prospective Study on Determination of Optimal Drainage Volume in Massive Pleural Effusion Based on Pleural Effusion Index”. E-CliniC, vol. 10, no. 2, Sept. 2022, pp. 372-8, doi:10.35790/ecl.v10i2.41495.