1. SEER Technology. Accusense Chemical Recognition System. Salt Lake City: SEER Technology. 2017. Available at
http://www.seertechnology.com/accusense
(accessed June 2017).
2. INFICON. Micro GC Fusion Gas Analyzer. Basel: INFICON. 2017. Available at
http://products.inficon.com/en-us/nav-products/Product/Detail/Micro-GC-Fusion-Gas-Analyzer?path=Products%2Fpg-ChemicalDetection
(accessed July 2017).
3. Defiant Technologies. Hand Held Gas Chromatography. Albuquerque: Defiant Technologies. 2017. Available at
www.defiant-tech.com
(accessed July 2017).
4. Electronic Sensor Technology. zNose® Portfolio. Newbury Park: Electronic Sensor Technology. 2009. Available at
http://www.estcal.com/products
(accessed July, 2017).
5. Gasmet Technologies. Portable DX4040 FTIR Gas Analyzer. Helsinki: Gasmet. 2017 Available at
http://www.gasmet.com/products/portable-gas-analyzers/dx4040
(accessed April 2017).