Rehm, J., Gschwend, P., Steffen, T., Gutzwiller, F., Dobler-Mikola, A., & Uchtenhagen, A. (2001). Feasibility, safety, and efficacy of injectable heroin prescription for refractory opioid addicts : a follow-up study. The Lancet, 358(27.10.2001), 1417–1420.