M. Haisch, P. Hering, W. Fuss, W. Fabinski: A Sensitive Isotope Selective Nondispersive Infrared Spectrometer for 13CO2 and 12CO2 Concentration Measurements in Breath Samples. In: Isotopenpraxis Isotopes in Environmental and Health Studies. Band30, Nr.2-3, Juli 1994, ISSN0021-1915, S.247–251, doi:10.1080/00211919408046740.
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M. Haisch, P. Hering, W. Fuss, W. Fabinski: A Sensitive Isotope Selective Nondispersive Infrared Spectrometer for 13CO2 and 12CO2 Concentration Measurements in Breath Samples. In: Isotopenpraxis Isotopes in Environmental and Health Studies. Band30, Nr.2-3, Juli 1994, ISSN0021-1915, S.247–251, doi:10.1080/00211919408046740.