Purwaningrum, Yayuk, Yenni Asbur, Halus Satriawan, Murni Sari, and Nurhayati. “Combination of Exploitation Systems to Optimize Yield of GT1 Clone in Smallholder Rubber (Hevea Brasiliensis) Plantation in Sumatera Utara, Indonesia”. Plant Science Today 10, no. 4 (August 31, 2023). Accessed December 22, 2024. https://horizonepublishing.com/journals/index.php/PST/article/view/2491.