Citation: Pm. Buszka et al., DETERMINATION OF NANOGRAM PER LITER CONCENTRATIONS OF VOLATILE ORGANIC-COMPOUNDS IN WATER BY CAPILLARY GAS-CHROMATOGRAPHY AND SELECTED-ION MONITORING MASS-SPECTROMETRY AND ITS USE TO DEFINE GROUNDWATER-FLOW DIRECTIONS IN EDWARDS-AQUIFER, TEXAS, Analytical chemistry, 67(20), 1995, pp. 3659-3667