title: Letters to the editor: a polar retention index system for gas-liquid chromatography.
mesh_terms: D000438:Alcohols; D002849:Chromatography, Gas; D004952:Esters / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis; D007659:Ketones; D008055:Lipids / Q000032:analysis*
chemical_list: D000438:Alcohols; D004952:Esters; D005227:Fatty Acids; D007659:Ketones; D008055:Lipids