Permana, I., 		Sumadiyasa, M., & 		Windarjoto, W.
2020 Oct  5.  The Separation Distance of the Diffraction Peak Angle between Main Planes (hkl) As an Indicator of the Orthorhombicity of the GdBa2Cu3O7-? Phase Crystal Lattice Structure. BULETIN FISIKA. [Online] 22:1