Nuernberg K, Dannenberger D, Ender K, Nuernberg G. Comparison of different methylation methods for the analysis of conjugated linoleic acid isomers by silver ion HPLC in beef lipids. J Agric Food Chem. 2007 Feb 07;55(3):598–602. doi: 10.1021/jf061865k. PMID: 17263447.