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), pp. 2572-2580. doi: 10.15419/bmrat.v5i8.466.