Poupaert, J., Vanderjeugd, P., Gerardy, BM., Claesen, M., & Dumont, P. (1981). Dibenzo-18-crown-6 As Phase-transfer Catalyst in Bockmuhl Synthesis of Methadone. Journal of Chemical Research. Synopses, 7, 192. https://hdl.handle.net/2078.5/145232 (Original work published 1981)