. "GC/MS" . "gas chromatography mass spectrometry" . "gas chromatograph \u2014 mass spectrometer" . . "gas mass-spectrometry (GC-MS)" . "gas chromatography-mass spectrometry (GC-MS)" . . "gas chromatography-mass spectrometer." . "GCMS" . . "gas-chromatography" . "spectral signature" . . "Gas chromatography\u2013mass spectrometry" . "Gas chromatography\u2013mass spectrometry#Ionization" . . . . "Gas chromatography/mass spectrometry" . . . "chromatography-mass spectrometric" . . "GC-MS" . "gas chromatography and mass spectrometry" . "Gas chromatography\u2013mass spectrometry" . "gas chromatograph-mass spectrometer" . "gas chromatography\u2013mass spectrometry" . "gas chromatography-mass spectrometry(GC-MS)" . "pyrolysis gas chromatography-mass spectroscopy" . . "gas chromatography mass spectrometer" . "Gas Chromatography-Mass Spectrometry assay" . . "gas chromatography (GC) \u2013 mass spectrometry (MS)" . "gas chromatograph\u2013mass spectrometers" . "Gas Chromatography coupled with Mass Spectrometry" . . "gas chromatography/mass spectroscopy" . "GC-MS/'''SFC'''" . "gas chromatograph mass spectrometers" . . "Gas chromatography\u2013mass spectrometry#Selective ion monitoring" . "Gas chromatography-mass spectrometry" . "gas chromatograph mass spectrometer" . . "gas chromatography" . "Coupled gas chromatography and mass spectrometry" . "Gas Chromatography-Mass Spectrometry" . "selective ion monitoring" . "gas chromatography-mass spectrometry" .