Sidabukke , Simon, et al. “The Opportunity of Understorey Species to Absorb Secondary Metabolites in the Soil (Case Study in IUPHHK- Industrial Plantation Forests PT. Toba Pulp Lestari, Tbk)”. Journal of Sylva Indonesiana, vol. 3, no. 01, Feb. 2020, pp. 40-45, doi:10.32734/jsi.v3i01.1982.