Zimmermann, R. ; Mühlberger, F. ; Fuhrer, K.* ; Gonin, M.* & Welthagen, W. An ultracompact photo-ionization time-of-flight mass spectrometer with a novel vacuum ultraviolet light source for on-line detection of organic trace compounds and as a detector for gas chromatography. J. Mater. Cycles Waste Manag. 10, 24-31 (2008)