?COMPARATIVE STUDIES OF BIOGENIC AMINES AND THEIR METABOLITES IN PERIPLANETA AMERICANA BY GAS CHROMATOGRAPHY/NEGATIVE ION CHEMICAL IONISATION-MASS SPECTROMETRY (GC.NICI-MS). (1995). Biological Sciences - PJSIR, 38(5-6), 172-178. https://www.v2.pjsir.org/index.php/biological-sciences/article/view/2467