Ranjini BN, and Vijay Siddhartha B S. “Dexmedetomidine Versus Lidocaineversus Ketamine to Alleviate Propofol Injection Pain: A Prospective Randomized Double Blind Study”. Academia Anesthesiologica International, Vol. 4, no. 2, Jan. 2020, pp. 353-6, doi:10.21276/aan.2019.4.2.80.