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The effects of racemic D,L-methadone and L-methadone in substituted patients--a randomized controlled study.

Verthein U, Ullmann R, Lachmann A, Düring A, Koch B, Meyer-Thompson HG, Schmidt R, Reimer J, Haasen C.

Drug Alcohol Depend. 2005 Nov 1;80(2):267-71.

Abstract

https://www.ncbi.nlm.nih.gov/pubmed/15916866