1. Old drugs and new challenges: a narrative review of nitazenes;Pergolizzi;Cureus,2023
2. Non-fentanyl new synthetic opioids - An update;Zawilska;Forensic Sci. Int.,2023
3. World Drug Report 2022, United Nations Office on Drugs and Crime, 2022.
4. Year in Review 2023;Krotulski,2024
5. Control of fentanyl-related substances in China;Bao;Lancet Psychiat,2019