Syahidah, ., and Tekat Dwi Cahyono. “ PENDUGAAN KEKAKUAN KAYU BORNEO DENGAN METODE GELOMBANG ULTRASONIK ”. PERENNIAL 6, no. 1 (January 1, 2010): 20-24. Accessed April 26, 2024. https://journal.unhas.ac.id/index.php/perennial/article/view/193.