Khoshfetrat, M., Davoodi, R. and Keykha, A. 2018. Comparing the effects of three different doses of caudal ketamine plus bupivacaine on pain control after paediatric surgery. Biomedical Research and Therapy. 5, 8 (Aug. 2018), 2572-2580. DOI:https://doi.org/10.15419/bmrat.v5i8.466.