K. Breiev, K. M. M. Burseg, G. O'Connell, E. Hartungen, S. S. Biel, X. Cahours, S. Colard, T. D. Märk, P. Sulzer: "An online method for the analysis of volatile organic compounds in electronic cigarette aerosol based on proton transfer reaction mass spectrometry", Rapid Commun. Mass Spectrom., 30: 691–697, 2016.