Zaeem, Khalid, et al. “STELLATE GANGLION BLOCK FOR THE IMMEDIATE TREATMENT OF FROSTBITE OF UPPER LIMB: Stellate Ganglion Block”. Pakistan Armed Forces Medical Journal, vol. 58, no. 1, Mar. 2008, pp. 41-44, https://pafmj.org/PAFMJ/article/view/1705.