1. ASHRAE (1981 ) "Ventilation for acceptable indoor air quality ", Atlanta, GA, American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE standard 62-1981).
2. ASHRAE (1989 ) "Ventilation for acceptable indoor air quality ", Atlanta, GA, American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE standard 62-1989).