A. Thomas, W. O. Sobechukwu, C. I. Nwamaka, and B. N. Flavious, “Greyscale Appearance of Film‑screen Radiographic Artefacts in a University Teaching Hospital”, WAJR, vol. 22, no. 2, pp. 82–85, Aug. 2025, doi: 10.82235/wajr.vol22no2.307.