Characterization of Sound Absorption Coefficient and Acoustic Impedance of Palm Frond Fiber Composites with Pine Resin on Various Composition Variations. JTM [Internet]. 30 April 2023 [dikutip 21 Agustus 2025];13(1):6-12. Tersedia pada: https://jtm.itp.ac.id/index.php/jtm/article/view/725