Sarhan, N. R., and Y. M. Taalab. “Oxidative stress/PERK/apoptotic Pathways Interaction Contribute to Tramadol Neurotoxicity in Rat Cerebral and Cerebellar Cortex and Thyme Enhances the Antioxidant Defense System: Histological, Immunohistochemical and Ultrastructural Study”. International Journal of Scientific Reports, vol. 4, no. 6, May 2018, pp. 124-41, doi:10.18203/issn.2454-2156.IntJSciRep20182083.