S. RINI, Z. A. MASUD, N. NASRULLAH, A. BEY, and S. TJITROSEMITO, “Tolerance Levels of Roadside Trees to Air Pollutants Based on Relative Growth Rate and Air Pollution Tolerance Index”, HAYATI J Biosci, vol. 15, no. 3, p. 123, Dec. 2009, doi: 10.4308/hjb.15.3.123.