N. A. Ahmed, A. M. Yehia, A. H. Mohamed, and A. Abdulwahhab, “Attenuation of the Airway and Cardiovascular Responses to Extubation in Chronic Smokers by Prior Treatment with Dexmedetomidine, Fentanyl, and their Combination”, Open Access Maced J Med Sci, vol. 9, no. B, pp. 1290–1295, Oct. 2021.