I. Brčić Karačonji, T. Jelača, A. . Jurič, and A. Lucić Vrdoljak, “Morphine and codeine in racing horse feed: is there reason for concern?”, Arh Hig Rada Toksikol, vol. 76, no. 1, Mar. 2025, doi: 10.2478/aiht-2025-76-3888.