Ahmad Bin Khalid, Ayesha Siddiqa, Syed Imran Haider, Gohar Alam, Nadeem Akram Butt. “Anatomical Variations on Routine CT Scans Observed in the Paranasal Sinuse”. Pakistan Journal of Medical & Health Sciences, vol. 16, no. 03, Apr. 2022, p. 731, doi:10.53350/pjmhs22163731.