Hasanat, Md Aminul, et al. “Efficacy of Tramadol, Low Dose Ketamine and Ondansetron in the Management of Intra-Operative Shivering After Sub Arachnoid Block”. Journal of National Institute of Neurosciences Bangladesh, vol. 4, no. 1, Sept. 2018, pp. 45-50, doi:10.3329/jninb.v4i1.38285.