Susanto, Edi, Hari Rionaldo, Zuchra Helwani, & Zulfansyah Zulfansyah. " Influences of the Operating Variables of Formic Acid Pulping on Pulp Properties of Perimping Grass." International Journal of Environmental Research & Clean Energy [Online], 12.1 (2018): 1-6. Web. 5 Jun. 2026