Nayak BB, Dash T, Mishra BK. Purple Coloured Natural Ruby: X-ray Photoelectron Spectroscopy, X-ray Diffraction, X-ray Tomography and Other Microstructural Characterizations. IJSBAR. 2016;25(2):94-114. Accessed December 10, 2025. https://gssrr.org/JournalOfBasicAndApplied/article/view/5123