W. Udaibah and A. Priyanto, “Synthesis and Structure Characterization of SiO2 from Petung Bamboo Leaf Ash (Dendrocalamus asper (Schult.f.) Backer ex Heyne)”, J. Nat. Scien. & Math. Res., vol. 3, no. 1, pp. 215–220, Aug. 2017.