Xiaodan Zhuang Jing Huang Gerasimos Potamianos Mark Hasegawa-Johnson Acoustic fall detection using Gaussian mixture models and GMM supervectors. 69-72 2009 ICASSP http://dx.doi.org/10.1109/ICASSP.2009.4959522 conf/icassp/2009 db/conf/icassp/icassp2009.html#ZhuangHPH09