Tomanić, D., Z. Kovačević, D. Stojanović, N. Stojanac, M. Erdeljan, and J. Mihajlović. “Tramadol for the Treatment of Pain in Companion Animals”. Biologia Serbica, vol. 43, no. 2, Dec. 2021, pp. 64-68, doi:10.5281/zenodo.5807243.