Nkereuwem, M.E. et al. 2021. Biostimulatory Influence of Biochar on Degradation of Petroleum Hydrocarbon Impacted Soil. Indonesian Journal of Social and Environmental Issues (IJSEI). 2, 3 (Dec. 2021), 227–234. DOI:https://doi.org/10.47540/ijsei.v2i3.333.