Tampubolon, G., I. A. Mahbub, and N. Neliyati. “Amelioration of Coal Post Mining Area In Promoting The Growth of Avocado (Persea Americana Mill.)”. Jurnal Silva Tropika, vol. 3, no. 1, June 2019, pp. 84-94, doi:10.22437/jsilvtrop.v3i1.6958.