Mohammad Omar Faruq, et al. “Role of Nigella Sativa (Black Cumin Seeds) As an Adjunct Therapy in Treating Severe and Critical COVID -19 Infection Compared to Those With Standard Therapy: An Open Label Randomized Clinical Trial”. Bangladesh Critical Care Journal, vol. 11, no. 2, Oct. 2023, pp. 75-82, doi:10.3329/bccj.v11i2.69187.