Rohiman, A. and Arifin, A. (2020) “Comparation of Pressed Powder Pellet and Fused Glass Bead Preparation Techniques for Mayor Elements Analysis of Rock Samples using X-Ray Fluorescence (XRF)”, Indonesian Journal of Physics, 31(2), pp. 24 - 27. doi: 10.5614/itb.ijp.2020.31.2.4.