Parsons, David; Jordan, Georgette; Cheggwidden, Dawn; Li, Xinrong; Thompson, Ruthanne & Abraham, Sherin. Indoor Air Quality: CO₂ Sensors and Demand Controlled Ventilation. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc226884/. Accessed September 19, 2014.
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