1. American Conference of Governmental Industrial Hygienists, 1991. Documentation of the Threshold Limit Values and Biological Exposure Indices, 6th ed. Cincinnatti, Ohio.
2. CEN TC264/WG2, 1995. Odour concentration measurement by dynamic olfactometry. Comittè Européen de Normalisation, Document 064/e.
3. The control of product and package quality with the electronic nose;Culter;Tappi Journal,1999
4. De Rossi, D., Serra, G., 1999. Process for preparing electro-conductive polymer films by doping with neutral polymers and chemical substances sensors obtained with these films. European Patent application EP 99200904.3.
5. Application of poly(thienylene vinylene) as a chemiresistor for organic vapours;De Wit;Synthetic Metal,1997