1. Heller SR, Milne GWA (1987) EPA/NIH Mass Spectral Data Base, Office of Standard Reference Data, National Bureau of Standards, Gaithersburg, MD, USA
2. McLafferty FW, Stauffer DB (1989) The Wiley/NBS Registry of Mass Spectral Data, Wiley, New York
3. Pfleger K, Maurer HH, Weber A (1992) Mass spectral and GC data of drugs, poisons, pesticides, pollutants and their metabolites, 2nd edn. VCH, Weinheim
4. Van den Dool H, Kratz PD (1963) J Chromatogr 11:463?471
5. Lee ML, Vassilaros, DL, White CM, Novotny M (1979) Anal Chem 51:768?773