Capillary Gas Chromatographic Determination of Gamma Aminobutyric Acid and Putrescine in Cerebrospinal Fluidusing Trifluoroacetylacetone As Derivatizing Reagent. Pak. J. Anal. Environ. Chem. 2018, 19 (1), 28 – 35. https://doi.org/10.21743/pjaec/2018.06.02.