1. Designation and Safety Classification of Refrigerants, ANSI/ASHRAE STANDARD 34-2013;ASHRAE,2013
2. Daiichi Nekken Co., Ltd. website: The principle of the measurement by the ultrasonic gas analyzer, http://www.us-analyzer.com/english/product/, (accessed 13.09.14.).
3. Physical hazard evaluation of A2L-class refrigerants using several types of conceivable accident scenario;Imamura,2013
4. Evaluation of fire hazards of A2L class refrigerants;Imamura,2012
5. HFO-1234yf: a Low GWP Refrigerant for MAC. Honeywell/DuPont Joint Collaboration;Spatz,2008