Permana, I Komang, 		Sumadiyasa, Made, AND 		Windarjoto, Windarjoto.
" 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" <em>BULETIN FISIKA</em> [Online], Volume 22 Number 1 (5 October 2020)