Hui Xie Fei Ma Huifang Fan Baoyu Shen Biological Sensor System Design for Gymnasium Indoor Air Protection. 572-576 2008 BMEI (2) http://doi.ieeecomputersociety.org/10.1109/BMEI.2008.264 conf/bmei/2008-2 db/conf/bmei/bmei2008-2.html#XieMFS08