D. Wahyudi, Irfan Kamil Siregar, and Diki Agustiawan, “MANAGING PALM OIL PLANTATIONS (Elaeis guineensis Jacq.) DURING THE NON-YIELDING PHASE BASED ON THE ANDROID GPS PRECISION INSTRUMENT ”, JAE, vol. 8, no. 2, pp. 67–75, Dec. 2024.