Jiang, Yifei, Kun Li, Ricardo Piedrahita, Xiang Yun, Lei Tian, Omkar M. Mansata, Qin Lv, Robert P. Dick, Michael Hannigan, and Li Shang. “User-Centric Indoor Air Quality Monitoring on Mobile Devices”. AI Magazine 34, no. 2 (June 21, 2013): 11. Accessed October 21, 2019. https://www.aaai.org/ojs/index.php/aimagazine/article/view/2472.