Darlan, Nuzul Hijri, Hasril Hasan Siregar, Eka Listia, and Edy Sigit Sutarta. “<strong>RECENT EVALUATION OF RISING TEMPERATURE AND OIL PALM EXTENSION TO HIGHER ELEVATION IN NORTH SUMATRA</strong><Br&gt;(EVALUASI TERKINI KENAIKAN SUHU DAN PERLUASAN TANAMAN KELAPA SAWIT KE DATARAN TINGGI DI SUMATERA UTARA)”. Agromet 23, no. 2 (December 12, 2009): 112-122. Accessed May 6, 2021. https://jma.journal.ipb.ac.id/index.php/agromet/article/view/3516.