1. Canadian Center for Occupational and Health and Safety (CCOHS)(2005).Health effects of carbon dioxide gas.https://www.ccohs.ca/(retrieved 2 February 2017).
2. Comité Européen de Normalisation (CEN)(2007).Indoor environmental input parameters for design and assessment of energy performance of buildings addressing indoor air quality thermal environment lighting and acoustics. European Standard. EN 15251‐2007.