Das, MBBS, MD, M., Jain, MSc, PhD, CChem FRSC (UK), R., Dhawan, MBBS, MD, A. and Kaur, MBBS, MD, A. 2016. Assessment of abuse liability of Tramadol among experienced drug users: Double-blind crossover randomized controlled trial. Journal of Opioid Management. 12, 6 (Nov. 2016), 421–430. DOI:https://doi.org/10.5055/jom.2016.0361.