Masturi, M. et al. 2023. HIGH STRENGTH MANGO LEAF WASTE/POLYURETHANE COMPOSITE REINFORCEMENT USING QUARTZ MATERIAL. Spektra: Jurnal Fisika dan Aplikasinya. 8, 1 (Apr. 2023), 55–64. DOI:https://doi.org/10.21009/SPEKTRA.081.05.