Liang Liu Mihail Popescu Marjorie Skubic Marilyn Rantz Tarik Yardibi Paul Cuddihy Automatic fall detection based on Doppler radar motion signature. 222-225 2011 PervasiveHealth http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6038799 conf/ph/2011 db/conf/ph/ph2011.html#LiuPSRYC11