Purwaningrum, Y., Asbur, Y., Satriawan, H., Sari, M. and Nurhayati 2023. Combination of exploitation systems to optimize yield of GT1 clone in smallholder rubber (Hevea brasiliensis) plantation in Sumatera Utara, Indonesia. Plant Science Today. 10, 4 (Oct. 2023), 198–205. DOI:https://doi.org/10.14719/pst.2491.