H. M. Adamu, E. Ekanem, and S. Bulama, “Identification of Essential Oil Components from Nigella sativa Seed by Gas Chromatography-mass Spectroscopy”, Pak. J. Nutr., vol. 9, no. 10, pp. 966–967, Sep. 2010, doi: 10.3923/pjn.2010.966.967.